About us

Tim Greiner, a Pure Strategies Co-founder and Managing Director, has pioneered approaches to building environmental and social integrity into products, brands, and businesses. He is also a co-founder of the Chemical Footprint Project and has guided sustainable chemicals management strategies for companies across diverse industries. His experience spans the spectrum from developing sustainability strategy, drafting sustainability goals, designing product sustainability programs, creating approaches to transform sustainable supply chains and facilitating a landscape level stakeholder process to improve climate and water quality outcomes.

Tim’s recent projects include helping build a leading climate strategy for Ben & Jerry’s, developing sustainability goals for King Arthur Baking, creating a corporate sustainability strategy for Lush, and developing a regenerative grazing standard for Timberland.

Bob Kerr, Co-founder and Principal of Pure Strategies, works with companies and public agencies to promote environmental and social sustainability — including initiatives on sustainability strategy, sustainable chemical programs, and climate strategy. His projects have included support for brands and retailers in building safer-chemicals programs for consumer products, an OSHA training program on reduction of hazardous chemicals in workplaces and assisting companies in using Chemical Footprint Project tools to guide and assess progress in sustainable chemistry. To support consumer product companies just starting on chemicals management issues, Bob authored Sustainable Chemicals Management Software: A Pure Strategies Review of Tools for Managing Chemicals in Products. Bob is a certified verifier for the Chemical Footprint Project. He has also supported development of climate and emission-trading strategies for companies and government agencies and led a Congressionally-mandated study evaluating the effectiveness of EPA and state emissions trading programs. Current and former clients include Ahold Delhaize, Ben & Jerry’s, Best Buy, Consumer Technology Association, OSHA, Radio Flyer, USEPA, and Walmart.

Bob was appointed by EPA’s Administrators to serve three terms on EPA’s National Advisory Council for Environmental Policy and Technology. As a Council member, he contributed to Council recommendations to broaden EPA’s roles in science education, citizen science projects to engage communities in environmental sustainability, and technical collaboration to support beyond-compliance supply chain sustainability initiatives.

Prior to consulting, Bob spent a decade working on environmental, energy and public health legislation on House and Senate Congressional staff and worked for EPA’s Policy Office on development of emissions trading programs.


Cheryl Baldwin, Ph.D., is a Vice President of Sustainability Consulting for Pure Strategies where she partners with corporate clients to develop and execute sustainability strategies to improve performance across retail, food and agriculture, home and personal care, and cosmetics industries. She also leads the firms’ global market research to generate new insights to accelerate business transformation.

Cheryl’s recent projects include helping build a leading nature strategy for Toyota Motor North America, developing sustainability goals for TAZO, creating a sustainable packaging strategy and implementation tools for Walmart, and advancing a sustainable chemistry program for Sephora. Cheryl also worked with industry groups to support broader impact including, FMI, the food industry association, and the National Retail Federation (NRF).

Cheryl authored Pure Strategies’ market research reports: Realizing Sustainable Packaging, Planet-Forward Strategies, Connecting to the Farm, Reaching the New Corporate Frontier, Advancing on the Path to Product Sustainability, and other reports.  She wrote the book, The 10 Principles of Food Industry Sustainability and is the lead author/editor for two additional books on sustainability, Greening Food and Beverage Services and Sustainability in the Food Industry and holds U.S. and international patents.

Prior to Pure Strategies, Cheryl led the life cycle research and sustainability standard program for the non-profit ecolabel organization Green Seal. Cheryl also worked in Research and Development for Kraft Foods, Inc. where she was involved in all phases of R&D from novel ingredient development to global product commercialization. Cheryl holds a Ph.D. and M.S. from Cornell University and a B.S. from the University of Illinois, all in Food Science.

Dave Chaffin, Ph.D., is a Senior Sustainability Advisor for Pure Strategies. He works with corporate clients to integrate nature and biodiversity into their sustainability strategies across direct company operations, value chains and responsible sourcing, and corporate climate commitments. Dave has extensive experience identifying, assessing and mitigating environmental and social risks in nature-based supply chains and is well versed in the rapidly expanding landscape of forest and nature related standards, targets and regulations including EUDR, TNFD, SBTN, Scope 3 FLAG and nature-based climate solutions. He focuses on strategic planning, value chain risk assessment, and corporate GHG accounting to help companies assess, disclose, and mitigate their forest and nature related impacts in a science-based way.

Prior to joining Pure Strategies, Dave led Kimberly-Clark Corporation’s global forest sustainability program. In that role, he worked to drive the responsible sourcing of forest-derived materials used in the manufacture of Kimberly-Clark products and packaging accounting for carbon and climate, biodiversity, and Indigenous rights related variables.

Previously, Dave served as Boreal Conservation Director for The Nature Conservancy, where he led a cross-functional team in designing and implementing TNC’s conservation strategy in the Canadian Boreal Forest, including working to increase Indigenous leadership and authority within North America’s largest commercial forest tenure in northwestern Manitoba. He has held marketing and business development positions with The Forest Stewardship Council (FSC), Fallon Advertising, and Best Buy.

Dave holds a Ph.D. in Natural Resources Science & Management from the University of Minnesota and a B.A. in Journalism and Mass Communication from the University of Wisconsin.

Tara Connelly has been a member of the Pure Strategies team since 2012. She has almost 20 years of office management experience, working in large financial institutions, publishing companies, and boutique firms. Tara received her undergraduate degree from the University of Massachusetts, Amherst and pursued graduate studies at Northeastern University. She has worked across all departments and currently leads Pure Strategies’ B Corp efforts both internally and externally.

Colleen Corrigan, Ph.D., is a Senior Sustainability Advisor for Pure Strategies. She works with corporate clients on developing strategies to promote sustainability in company operations, value chains, material selection and natural resources management. Colleen focuses on helping companies set science-based targets for nature to protect and regenerate biodiversity. Her work in this area helps companies understand their impacts and implement strategies, collaborations, and business process changes to mitigate harm to and restore affected ecosystems.

Prior to joining Pure Strategies, Colleen was the founder of Conservation Matters, an organization that consults on biodiversity protection, strategy development, and program delivery with a focus on marine protection, indigenous issues, and environmental governance for clients including National Geographic, UNESCO, and the World Wildlife Fund.

Previously, Colleen was a senior officer in protected areas at the United Nations Environment Programme’s World Conservation Monitoring Center in the UK. She was also senior manager for international sustainable development policy with Conservation International and learning facilitator for international field programs at The Nature Conservancy. Her career has included working with three branches of the U.S. Department of the Interior.

Colleen holds a Ph.D. from the School of Earth Sciences and Environmental Management at the University of Queensland, Australia and an M.S. in Conservation Biology and Sustainable Development from the University of Wisconsin-Madison.

Melanie Fleming is the Marketing Manager for Pure Strategies where she is responsible for helping to implement the company’s strategic marketing plan and elevate brand awareness. She supports the sustainability consulting team with marketing and business development analysis, research, and communication tools. Melanie oversees the success of various marketing initiatives, including corporate events, speaking engagements, and campaigns. She analyzes marketing and business development trends and manages all social media and website content. Melanie contributes to the development of content through planning, writing, and editing client case studies, industry articles, press releases, the Pure Strategies’ blog, and the monthly newsletter. 

Prior to her work at Pure Strategies, Melanie worked for more than fifteen years in marketing, business development, and public relations. She provided strategic counsel to executive management and developed customized marketing programs and creative public relations strategies that positively impacted business and revenue goals. Melanie has led successful marketing programs for Xerox, Thomson Communications’ clients Boston Private Bank & Trust, The Northeast Arc, Care Dimensions, and others. 

Melanie holds a bachelor’s degree in Communications, Commonwealth Honors Scholar, University of Massachusetts, Amherst and pursued graduate studies in Broadcast Journalism. She has received numerous awards for creative writing, including three Bell Ringers, two APEX Publications Excellence awards, and several American Graphic Design merits.

Natalie Harrah is a Business Development Associate for Pure Strategies where she is responsible for researching and identifying business opportunities in the target market, helping the consulting team understand potential new work areas with existing and recent clients, assisting in preparing proposals, presentations, and other materials for sales meetings and events, and collaborating with the business development team to create and implement effective sales strategies.

Prior to Pure Strategies, Natalie was a Business Development Associate and Recruitment Consultant for NextWave Partners. Prior to this position, she was a Recruitment Consultant for True Search. Natalie started her career in supply chain as an Inside Sales Representative for Novelis.

Natalie holds a B.A. in Communications Studies with a Minor in Global Health, Sustainability from the University of Georgia.

Kate Harvey is a Senior Sustainability Advisor for Pure Strategies. She supports corporate product, and supply chain sustainability work with market research, data analysis, benchmarking of corporate activities, and corporate engagement strategy development. Kate has worked with clients including MegaFood, Seventh Generation, and Walmart.

Her recent projects include helping major food retailers to build proactive approaches to animal welfare in the food supply chain, assisting with development of sustainable food sourcing strategies, and facilitating the development of strategic chemicals management efforts for food, packaging, home and personal care products.

Prior to her work at Pure Strategies, Kate worked for over a decade at the Consensus Building Institute, Ceres, and independently as a facilitator for multi-stakeholder engagements in the U.S. and abroad related to sustainability issues, such as renewable energy siting, corporate environmental performance, and public policy development.

Kate has a Master’s Degree in Environmental Policy and Conflict Resolution from the Fletcher School of Law and Diplomacy at Tufts University and a Bachelor’s Degree in international relations from Schiller International University in Madrid.

Natalie Kaner is a Sustainability Advisor for Pure Strategies where she helps clients develop corporate sustainability strategies and greenhouse gas inventories. She also works with clients on responsible sourcing and sustainable supply chain initiatives, such as regenerative agriculture.

Prior to joining Pure Strategies, Natalie worked as a Senior Strategic Sourcing Specialist for Stonyfield Farm and Lactalis, managing a broad portfolio of co-manufacturing suppliers in the US and Canada. In addition, she worked as the Project Coordinator of the Sustainable Food Group at IPM Institute of North America, a non-profit dedicated to working with food companies and producers to improve sustainability in agriculture. She also was a Social Research Scientist with the Wisconsin Department of Natural Resources.

Natalie holds an M.S. in Agriculture, Food and Environment from the Tufts University Friedman School of Nutrition Science and Policy. Natalie also holds a B.A. in Environmental Studies and Conservation Biology from the University of Wisconsin-Madison.

Cora Kerber is a Sustainability Advisor for Pure Strategies where she is responsible for helping clients conduct life cycle assessments (LCAs) and develop greenhouse gas (GHG) inventories for science-based targets, in addition to supporting regenerative agriculture projects.

Prior to joining Pure Strategies, Cora was an Account Manager for Steward Lending where she managed complex projects, directing funds to regenerative farmers, ranchers, and Consumer Packaged Goods (CPG) companies. In addition, she worked with farm partners to assess their regenerative practices, review business financial health, and develop sustainability strategies. She also worked with the University of Kentucky to develop innovative interventions for addressing food insecurity and food waste on campus.

Cora holds an M.S. from Tufts University Friedman School of Nutrition Science and Policy in Agriculture, Food and Environment. She also holds a B.A. in Biochemistry from Transylvania University in Lexington, KY.

Matt Kopac is a Senior Sustainability Advisor for Pure Strategies. In this role, Matt is developing and executing sustainability strategies for corporate clients in retail, personal care, cosmetics and food industries with a focus on circularity, responsible sourcing, decarbonization, GHG and plastic accounting, and product transparency and sustainability.

Prior to Pure Strategies, Matt led strategy and operations for responsible sourcing, sustainable packaging, and climate action as Director, Sustainability for Beautycounter. He worked to revamp the company’s sourcing strategy and oversaw audits of the brand’s mica and palm oil supply chains for human rights, labor, the environment, and traceability. Matt also achieved RSPO certification for over 100 products and updated the brand’s packaging supplier guidelines for material health, while influencing product briefs to align with packaging goals for reuse, recycled content, and recyclability.

Prior to Beautycounter, Matt worked for Burt’s Bees as the Associate Director, Sustainability and as Vice President of The Burt’s Bees Foundation. He developed and led sustainability strategy covering product innovation, climate, and waste, spearheaded the company’s first reusable packaging initiatives, reduced the company’s virgin packaging footprint, and launched a market-leading initiative to invest in the recovery and recycling of plastic waste from the environment while supporting living wage work.

Lisa Murphy is a Sustainability Associate for Pure Strategies where she helps with data management and analysis for our clients in their work on safer chemicals, sustainable packaging, and greenhouse gas calculations and inventories. Lisa has also helped clients with reporting progress publicly and answering THESIS surveys.

Prior to Pure Strategies, Lisa worked as a financial operations manager for Iron & Air Magazine, York Athletics Manufacturing, and iProspect, a search engine marketing firm. Lisa holds an MBA in International Economics from Nichols College and a B.S. in International Economics and Natural Sciences and Geography from Assumption University.

Kristi Peyton is a Sustainability Advisor for Pure Strategies. She works with clients to help develop sustainability strategies, advance regenerative agriculture in supply chains, and track and reduce greenhouse gas emissions to align with science-based targets.

Prior to joining Pure Strategies, Kristi worked as a Technical Account Manager for Upstream Tech. She was the primary account manager for enterprise and strategic customers, providing technical expertise on leveraging remote sensing data for monitoring, analysis, and reporting across a range of conservation and environmental industries, including forestry, agriculture, carbon, and mitigation banking to enhance sustainability impacts. She also worked at EverPower Wind Holdings managing wind energy projects from the early stages of preparing for permitting and construction to maintaining up-to-date data on active projects.

Kristi holds an M.S in Agriculture, Food and the Environment from the Tufts University Friedman School of Nutrition Science and Policy and a B.A. in Environmental Studies, minor in Chemistry, from the University of Pittsburgh.

Ariella Sela is a Senior Sustainability Advisor for Pure Strategies where she is responsible for developing climate and greenhouse gas (GHG) emissions inventories, science-based targets, and strategies. She also supports corporate sustainability strategy, sustainable packaging, and regenerative agriculture projects for clients.

Prior to joining Pure Strategies, Ariella was a Sustainability Analyst for Corporate Reports Inc. (CRI), where she developed strategy, content, goals, and key performance indicators for Fortune 500 client sustainability reports and designed and conducted client materiality assessments. She also worked at Novelis, the world’s leading aluminum recycler, on sustainability and environmental reporting as well as supplier sustainability.

Ariella holds an M.S. from Tufts University’s Friedman School of Nutrition Science and Policy in Agriculture, Food & Environment, an M.P.H. from Tufts University Medical School, and a B.S. in Environmental Science with concentration in Sustainability Management from Emory University.

Aarti Singh is a Sustainability Advisor for Pure Strategies. She works with clients on climate strategies, with an emphasis on reduction plans for Forest, Land, and Agriculture (FLAG) GHG emissions. She also supports sustainability strategy development and implementation, including in packaging and agriculture supply chains.

Prior to joining Pure Strategies, Aarti worked for the Environmental Defense Fund (EDF) Climate Corps, where she had a short-term assignment with Wendy’s restaurants. This work involved helping Wendy’s evaluate forestry, land use, and agriculture (FLAG) emissions aligned with the Science Based Targets initiative’s (SBTi) FLAG Guidance. She gathered internal and supplier data, prepared analyses, drafted recommended targets, and identified opportunities for FLAG emissions reductions in Wendy’s direct supply chain. Prior to this, Aarti had various experiences supporting women empowerment in agriculture production and building sustainability programs.

Aarti holds an M.S in Agriculture, Food and the Environment from the Tufts Friedman School of Nutrition Science and Policy and an M.S. in Agroforestry from Birsa Agricultural University (BAU) in India.

Lou Tarricone works with organizations to reduce the environmental footprints of their supply chain, operations and products, and to integrate environmental sustainability into their corporate strategy. This includes developing carbon footprint and carbon tax strategies.

Lou has worked extensively with a major global retailer in assessing and driving improvements in environmental and social sustainability into their supply chain, and has assisted companies in the apparel, consumer products, and food industries on strategies for responding to their customers’ sustainability surveys. Lou has performed product Life Cycle Assessment activities in the food, cleaning products, personal care, and sporting goods industries. Recent clients include Walmart, Ben & Jerry’s, VF Corporation, Radio Flyer, Seventh Generation, Ocean Spray, and Annie’s.

Lou is registered by The Sustainability Consortium as a TSC Service Provider, having received TSC training in providing tools and services to the consumer goods industry and to retailers.  Lou is qualified to assist with the full complement of TSC tool kits and has experience working with retailers and their suppliers in analyzing results as well as preparing responses, engaging supply chains and planning improvements.

Lou has over twenty years of experience in engineering, management, and technology consulting. Prior to joining Pure Strategies, Lou was a leader in a large corporate sustainability initiative, assisting in the design of U.S. energy audit procedures, and leading energy conservation and recycling efforts for the New England business unit.

Lou has developed and implemented plans to reduce energy consumption in manufacturing facilities, including the implementation of an automated HVAC system for a 1.1 million square foot manufacturing facility, saving over 20% in energy usage. In addition, Lou has participated in the management and design of a LEED Gold office renovation on a former brownfield site and has led technology-consulting projects across multiple industries, including a third-party vendor assessment for a Fortune 500 corporation.

Lou holds a master’s degree in Mechanical Engineering from the Massachusetts Institute of Technology, with thesis work in real-time control of semiconductor manufacturing, and a bachelor’s degree in Mechanical Engineering with a concentration in Electrical Engineering from Kettering University.

Kate Winnebeck is a Senior Sustainability Advisor for Pure Strategies where she works with corporate clients to develop sustainability strategies and specializes in material and system modeling via life cycle assessment to evaluate environmental impact.

Prior to Pure Strategies, Kate worked for more than fifteen years at the New York State Pollution Prevention Institute in multiple roles. As the LCA program lead, Kate performed studies for numerous clients, including peer-reviewed LCAs that companies used for internal decision-making and external marketing of their products. In her role as the Emerging Contaminants Program Manager, she worked to identify sources of 1,4 dioxane and PFAS in consumer products and developed strategies to reduce them. Recent work included assisting start-ups to calculate environmental impact during product design and development.

Kate holds an M.S. in Environmental Health & Safety Management and a B.S. in Environmental Management & Technology, both from the Rochester Institute of Technology. Kate is a Life Cycle Assessment Certified Professional (LCACP).