Douglas Sheldon, Managing Executive


Douglas Sheldon is Managing Executive of NouriTech™. Previously he served as Vice President, Operations for Calysta. He joined Calysta in that role in 2016, with responsibility for the overall operations of the company, including the construction and operation of production facilities, oversight of capital projects and expansions, supply chain, development of world class production capabilities and long term manufacturing strategy that addresses future capacity additions in line with the broader strategy of the company and its current and future business partners.

Mr. Sheldon joined Calysta after a 30-year career at Dow Chemical, one of the world’s leading chemical manufacturers. At Dow, Mr. Sheldon held positions ranging from engineering, capital projects, plant operations and management of world scale assets to development of Dow’s global site services for facilities in the Americas, Europe and Central and Southeast Asia. Most recently, he oversaw site expansions, divestitures, consolidations and site service development for multiple Dow global facilities as Global Offering Director and Commercial Director for the Dow Services Business, and for the Mergers, Acquisitions and Divestitures Technology Center for Dow operations in Houston, Texas.

Previously, as Program Director, Thailand Growth Project, he contributed to Dow’s presence in Thailand and led the >$2 billion Thailand MEGA project, starting with the due diligence of Dow’s JV partner’s Cracker and resulting in several downstream derivative Dow facilities. He also held management positions at Dow plants in the Netherlands and in Texas, Illinois, Missouri and Georgia. Mr. Sheldon holds a Bachelor’s degree in chemical engineering from the University of Michigan.

To download photo click here.


Edward Mikolay

MERS of Michigan

Edward Mikolay joined the NouriTech Board of Directors and the Calysta Board of Directors in 2016. He is a Senior Investment Officer and Director of Private Markets for the Municipal Employee Retirement System (MERS) of Michigan. In this role, he is responsible for new investment origination and oversight of the private investment portfolio, including private equity, real assets (infrastructure, energy, real estate, and agriculture/farmland) and diversifying strategies. Mr. Mikolay is a voting member of the Portfolio Review Committee, which is responsible for all portfolio management decisions, including asset manager selection and strategic asset allocation implementation. Mr. Mikolay serves on a number of private partnership advisory boards and is a frequent speaker at industry conferences.

Mr. Mikolay joined MERS in 2013 and has nearly 20 years of investment experience, most recently as a portfolio manager at the State of Michigan Retirement Systems (SMRS) in its Real Estate and Infrastructure Division. At SMRS, Mr. Mikolay was involved in a variety of portfolio management roles, including sourcing and underwriting new investments, overseeing dispositions and representing SMRS during partnership restructurings. He was also active on the advisory boards of many of those investments. Before his employment with SMRS, Mr. Mikolay was a real estate investment professional at CB Richard Ellis in Grand Rapids, Michigan. He has also held roles in real estate acquisitions at Heitman Capital Management, a pension fund advisory firm, and Equity Residential Properties Trust (NYSE: EQR), both based in Chicago.

Mr. Mikolay is a graduate of Brown University (Providence, RI) with a Bachelor of Arts degree in mathematical economics. He also earned a Masters of Business Administration degree from the Kellogg Graduate School of Management at Northwestern University (Evanston, IL), with majors in Finance, Entrepreneurship, and Real Estate.

John Ranieri, Ph.D.

The Wharton School, University of Pennsylvania

John Ranieri, Ph.D., joined the NouriTech Board of Directors in 2016. He is CEO/Managing Partner of MarketBridge Asset Management LLC and managing director of the Global Innovation and Growth Initiative at the Entrepreneurial Research Center at the Wharton School. He also serves on the advisory board for the venture capital firm, Emerald Technology Ventures. He also serves on the advisory board for the venture capital firm, Emerald Technology Ventures. He was previously vice president/general manager for DuPont, responsible for the development of a broad portfolio of businesses across a wide range of industries that include renewably sourced materials, chemicals, fuels, nutrition, and enzyme solutions. He also served as a board member and oversaw DuPont Tate & Lyle Bio Products Company, LLC, Butamax® Advanced Biofuels, LLC, and Actamax Biomedical businesses. He joined DuPont in 2002 as vice president & general manager for DuPont Bio-Based Materials. During his leadership, the business achieved rapid and sustainable growth for a broad portfolio of renewably sourced products and technologies including Sorona® biobased polymers/PDO, Biospecialties and Biofuels.

Prior to joining DuPont, he was vice president/managing director of the cardiovascular and biomaterials divisions at Aortech International and vice president of Sulzer Biologics and corporate director responsible for the start-up, design and management of the therapeutics portfolio for Sulzer Innotec. He received a Ph.D. in medical science and a master’s degree in materials engineering as a Miccioli fellow from Brown University and was an assistant doctorant at the division of surgical research and gene therapy at Lausanne University Medical School. He completed the advanced management program at the Wharton Business School and was visiting faculty within entrepreneurial research studies. Dr. Ranieri speaks often at numerous industry conferences and to industry media.

Alan Shaw, Ph.D.


Alan Shaw, Ph.D., is President and Chief Executive Officer of Calysta, and a member of the Board of Directors. He joined in 2012. He joined the NouriTech Board of Directors in 2016. Dr. Shaw is a veteran biotechnology entrepreneur and chemical industry executive, with more than 25 years experience building and leading technology companies.

Before joining Calysta, he served for ten years as President & CEO and a director of Codexis, a developer of cost-advantaged processes for production of biofuels, biobased chemicals and pharmaceuticals. During his tenure, Codexis completed an IPO and expanded from a startup to a global industrial biotechnology company with operations in the United States, Europe and Asia.

In 2010, Dr. Shaw received the Ernst and Young Entrepreneur® of the Year Award in the life sciences category for Northern California. He serves as a biotechnology advisor to the governments of the United Kingdom and Malaysia, and is a frequent speaker on energy to leading business and industry conferences.

Prior to Codexis, Dr. Shaw held senior operating and business development positions in the United Kingdom for Chiroscience Group plc and for the chemical and biopharmaceutical units of Clariant and BTP plc from 1994-99. For the previous 15 years, he held management and scientific leadership positions for Imperial Chemical Industries plc (ICI)/Zeneca, including Business Head, Fine Chemicals and Marketing Manager, European Sales. Dr. Shaw is a past board member of BIO and chair of BIO’s industrial and environmental section. He holds a bachelor’s degree in chemistry from Teesside University and a Ph.D. in chemistry from the University of Durham, England, and is a fellow of the Royal Society of Chemistry.

Brian Silvey


Brian Silvey joined the Calysta Board of Directors and the NouriTech Board of Directors in 2016. As Vice President and Director of Global Bioindustrials for Cargill, Mr. Silvey is responsible for the global strategy, business development and client management to drive business growth and market share. Mr. Silvey has more than 35 years of leadership experience at Cargill, with a particularly strong focus on business development, operations, management, and marketing.

Before taking his current role, Mr. Silvey managed Cargill’s bioethanol, citric acid and industrial starch product lines; sustainability efforts; joint ventures; and onsite partnerships for Cargill Starches & Sweeteners North America business division. Prior to that he oversaw Cargill’s facility in Blair, Neb., one of the largest Cargill corn milling operations globally. Over the course of his career, Mr. Silvey has served in a variety of leadership roles, including assistant vice president of Aligned Products for Corn Milling in Blair, Neb., and president/general manager of Cargill Rice Milling in Greenville, Miss. Mr. Silvey began his Cargill career in 1979 as a Los Angeles-based commodity trader.

Mr. Silvey holds a Bachelor of Arts degree from Harvard University. Currently, he serves on the Board of Directors for NouriTech, Calysta and Rivertop Renewables. Throughout his career, Mr. Silvey has been active on numerous community boards and in various industry associations.

W. Preston Stahl, Jr.

Bessemer Trust

Preston Stahl joined the NouriTech Board of Directors in 2016. Mr. Stahl is a Managing Director and Regional Director at Bessemer Trust. In this role, he is responsible for Bessemer’s client relationships in areas of Texas, as well as the management of Bessemer’s Dallas office. He also provides thought leadership in the area of commodities, primarily within the Strategic Opportunities portfolio and Fifth Avenue Real Assets 3 LLC. He is a member of the firm’s Investment Policy and Strategy, and Asset Allocation Committees. He is a member of the Investment Committee for Isidore Newman School, an independent school in New Orleans, LA.

Mr.Stahl earned an M.Sc. from the London School of Economics and Political Science, an M.B.A. from Tulane University, where he was a Morton Aldrich scholar, and a B.S. from Vanderbilt University.

Bessemer Trust is a privately owned and independent multifamily office that has served individuals and families of substantial wealth for more than 100 years. Through comprehensive investment management, wealth planning, and family office services, we help clients achieve peace of mind for generations.

Blake Campbell



Calysta, Menlo Park, CA, is an innovator in sustainable products to improve worldwide food security. Calysta Nutrition develops and commercializes FeedKind® protein, an alternative feed ingredient for fish, livestock and pet nutritional products.


Cargill provides food, agriculture, financial and industrial products and services to the world. Together with farmers, customers, governments and communities, we help people thrive by applying our insights and 150 years of experience. We have 150,000 employees in 70 countries who are committed to feeding the world in a responsible way, reducing environmental impact and improving the communities where we live and work. For more information, visit Cargill.com and our News Center.

Fifth Avenue Real Assets 3 LLC

Fifth Avenue Real Assets 3 LLC is advised by Bessemer Trust Company. N.A. Bessemer Trust is a privately owned and independent multifamily office that has served individuals and families of substantial wealth for more than 100 years. Through comprehensive investment management, wealth planning, and family office services, we help clients achieve peace of mind for generations.

MERS of Michigan

The Municipal Employees’ Retirement System (MERS) of Michigan is an independent, professional retirement services company that serves municipal members across the state of Michigan. We manage 2,000 retirement and employee benefit plans for over 800 municipal members — with a combined value of nearly $9 billion. MERS proudly serves more than 100,000 participants, including local firefighters, nurses and the men and women who plow our roads and keep our bridges safe.