Our Team

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Executive Team

More than leadership. Seasoned leadership. Operating since 1945, we know every type of market. We know the ag and turf markets. The market for public health officials. For investors. For new and emerging technologies. Every menial or major decision you must make, we've likely been there before—and we're ready to help you now.

Eric Wintemute
Chairman & CEO
Eric Wintemute was elected as President of AMVAC and Chief Executive Officer of American Vanguard Corporation in mid-1994. Mr. Wintemute had joined the company in January 1994 as Executive Vice President, Chief Operating Officer, and a member of the Board of Directors following American Vanguard's acquisition of GemChem Inc., a national and international chemical distribution company he co-founded in 1991. From 1977 to 1982, he worked for AMVAC in a variety of sales, purchasing, and production control capacities. Previously, as Vice President and Director of R.W. Greeff & Co. from 1982 to 1991, Mr. Wintemute oversaw the national and international distribution of key AMVAC chemical products. Mr. Wintemute holds a Bachelors of Science in Economics from the University of California, San Diego.
Bob Trogele, PhD
Chief Operating Officer and Executive Vice President
Ulrich (Bob) Trogele joined AMVAC in January 2015 to focus on growing the business across multiple product lines and geographies, achieving greater profitability, and establishing a pipeline of future opportunities through innovation and strategic relationships. As COO he oversees sales, marketing, and business development on a global basis. Additionally he has been a voluntary Adjunct Professor at the Berlin School of Economics & Law, educating Asian European MBA’s as future leaders in global business and society. He is an independent board director of Clean Seeds Capital Group and the Farm Journal Foundation and sits on the board of the Agricultural Retailer Association.
David T. Johnson
Vice President & Chief Financial Officer
Mr. Johnson has served as Chief Financial Offer of the Company since March 7, 2008. He served as Finance Director for Amcor Flexibles UK Ltd., a five hundred million dollar manufacturer of decorative packaging and a subsidiary of Amcor, a multibillion dollar corporation based in Australia from June 2003 through March 2008. Prior to that he served as Vice President of Finance for Sterer Engineering, a subsidiary of Eaton Aerospace, an eight billion dollar Cleveland based multinational company from April 2001 through June 2003. David earned his business degree from the University of Coventry in Great Britain and is certified as a Chartered Financial Accountant.
Timothy J. Donnelly
Vice President, General Counsel, Chief Administrative Officer and Corporate Secretary
Mr. Donnelly recently has served as Vice President, General Counsel and Secretary at DDi Corp. (Nasdaq: DDIC), a publicly held printed circuit board manufacturer, since June 2000. Mr. Donnelly managed a broad array of legal responsibilities including business plan and strategy development, SEC filings, M&A, Sarbanes-Oxely compliance, corporate governance issues, securities offerings and private placements, as well as negotiations with the EPA. From 1991 – 2000, he served as Assistant General Counsel at Rockwell International Corporation where he handled M&A, various licensing agreements and corporate litigation for the company. From 1986 — 1990, Mr. Donnelly was an Associate with the law firm Latham & Watkins where his responsibilities included corporate transactional work and civil litigation. Mr. Donnelly holds a Bachelor of Arts Degree in English from John Carroll University and a Juris Doctor from Northwestern University Law School.
Peter Eilers
Managing Director
AMVAC Netherlands BV International
Peter joined AMVAC BV in August 2015 as Global Director of Business Development and Marketing. From January 2017 until May 2018 he executed the responsibilities of this function as VP and officer of AMVAC Corp., based in Newport Beach, California. In June 2018 he has assumed the role as Managing Director of AMVAC B.V. and AMVAC’s International business (based in Houten, Netherlands). Peter has over 25 years’ previous experience with Bayer CropScience (and its predecessors) where he served as Marketing Director for EMEA (with annual sales over €2.5 billion), Executive Head of Bayer CropScience Merger & Acquisitions/Business Development, and Country Head in various regions, including Poland, the Baltics, Iberia and Indochina, among other positions.
Scott Hendrix
Senior Vice President, U.S. and Canada Crop Sales and Application Technology
Mr. Hendrix has led the Company’s U.S. Crop Sales Teams since January 2015 and is responsible for AMVAC’s national sales strategy and equipment, while overseeing three regional business units and AMVAC’s U.S. key account management team and customer service team. Previously, he served as AMVAC Regional Sales Manager for the Southeast Region from March 2010 to January 2015, where he had account responsibilities for several key customers, co-developed marketing plans and distributor/retail initiatives, and developed national sales incentive policies. Mr. Hendrix previously served in several sales, marketing and management capacities throughout the western and southeastern U.S. while employed by Syngenta Crop Protection. He holds a Bachelor of Science degree in Agribusiness with minors in Agronomy, Ag Economics, Agriculture and Business Administration from Northeast Louisiana University (now University of Louisiana Monroe).
William A. Kuser
Director of Investor Relations and Corporate Communications
Mr. Kuser joins American Vanguard from Chemtura Corporation (NYSE: CEM) where he held roles in corporate strategy and investor relations over the last 12 years. His extensive career in the chemical industry includes prior experience in financial analysis, marketing, operations and business management. Bill earned his undergraduate B.A. degree in Economics from Rutgers University in 1973 and his MBA from the University of Pennsylvania-Wharton Graduate School in 1975.
Peter Porpiglia, Ph.D.
Vice President, Global Product Development and Technical Support
Peter’s role in Product Development spans the US and Global organization. Prior to joining AMVAC, Peter was Head of Product Development at Arysta LifeScience, Vice President of Development at TyraTech, Vice President of R&D at Kumiai Chemical Industry, Ltd. and Head of R&D for the Herbicide Business Unit of Syngenta (formerly CIBA -GEIGY, Novartis). In prior roles, Peter has led the commercial development of over two dozen chemical active ingredients as well as several natural products in all sectors of crop protection. Peter has recently served as an executive board member of the Weed Science Society of America and the Iowa Pest Resistance Management Program representing all of the agricultural industry. Peter is active in several other scientific societies and organizations. Peter holds a Bachelor of Science degree from Cornell University as well as a Master of Science and Doctor of Philosophy from Virginia Tech.
Anne Turnbough, Ph.D.
Vice President of Regulatory Affairs
Anne has over two decades of experience in managing regulatory compliance for a broad range of pesticides, fertilizers and adjuvants, including both chemicals and biologicals, in over 60 countries. Prior to joining AMVAC, she served as Global Director of Compliance & Regulatory Affairs for Oro Agri, Director of Regulatory Affairs for Control Solutions, Inc., and Global Regulatory Manager for Novozymes Biologicals Ltd. Anne holds both Masters and Doctorate degrees in Inorganic Chemistry from the University of Missouri in St. Louis, and both a Bachelor of Science degree in Applied Biochemical Sciences and a Diploma in Industrial Business Management from the University of Ulster, Northern Ireland. Over the course of her career, Anne has established an excellent working relationship with Global regulatory bodies including U.S. EPA, successfully obtained and defended numerous Active Ingredient, new product registrations, and built processes and teams to ensure the highest level of compliance globally.
Suneet Ranganath
Vice President – Global Supply Chain and President of GemChem, Inc. | AMVAC Vice President of Global Supply Chain & Operations
Vice President – Global Supply Chain and President of GemChem, Inc. – He most recently served as Strategic Sourcing Director at DuPont, where he managed procurement for both the crop protection and seed businesses. Suneet has a J.D. from Widener Law, an MBA from the University of Delaware and a BS in Chemical Engineering from the University of Cincinnati. AMVAC Vice President of Global Supply Chain & Operations – Suneet joined us last May with more than 25 years of experience in operations, supply chain and technical roles in agrochemicals, specialty chemicals and plastics. In his new role, Suneet will be responsible for all procurement (whether related to manufacturing, GemChem or otherwise), strategic oversight of our manufacturing assets, make-versus-buy decisions, internal tolling activity and third-party tolling of active ingredients.
Andrew Naughton
Vice President of Technology
Andrew (Andy) Naughton joined AMVAC August 2022 as Vice President of Technology. Andy has over three decades’ experience in industrial chemical production having served in Fine Chemicals (Lonza), Antioxidants / Light Stabilizers (Ciba), Herbicides (BASF) and Nutritional Chemicals (DSM) on three continents. Andy has a Ph.D. in Synthetic Organic Chemistry from Rutgers, The State University of New Jersey as well as an MBA from Quincy University and a Master’s Degree in Chemical Engineering from the New Jersey Institute of Technology. Prior to joining us Andy worked as Manager of Process Engineering at EI Associates in New Jersey. Andy combines solid foundations in both Chemistry and Engineering with a passion for Process Improvement, Six Sigma Methodology, and Project Management.