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Executive Team

Eric Wintemute
Chairman & CEO
Eric Wintemute was elected to the post of of AMVAC's President and American Vanguard Corporation's Chief Executive Officer 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 a 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 will oversee sales, marketing, and business development on a global basis.
Over the past 28 years, Bob has worked in positions of increasing responsibility within the agribusiness sectors of agrichemicals, biotechnology and plant nutrition, culminating with 10 years at FMC Corporation, where he served most recently as President – Asia Pacific across 20+ countries and, for several years prior, as North American Area Director of its agricultural solutions business.      
Prior to his business career, Bob was a four-year starter and captain on the Wichita State basketball team, professional basketball player, representing the German national team as a two-time Olympian - in the course of which he attained both an MBA and PhD from the University of Goettingen. He is fluent in both German and French and since 1997 has served as a professor of international business at the Berlin University, Germany, School of Economics and Law, where he teaches Global Business & Management to international MBA students.

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 Porpiglia, Ph.D.
Vice President of 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 let 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.

Peter Eilers
Managing Director, AMVAC Netherlands BV​
Peter joined AMVAC BV in August 2015 as Global Director of Business Development and Marketing and assumed his current role in January 2017. His responsibilities include growing AMVAC’s business globally through acquisitions, license opportunities, partner alliances, and effective marketing programs. Peter oversees AMVAC’s Business Development, Equipment, and Marketing Teams and closely collaborates with senior management to analyze new business opportunities, build models for emerging projects, develop customer programs, and launch new products and delivery systems. 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, 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).

Johann Venter
Vice President and Director of Technology
Dr. Venter joined Amvac Chemical on December 1, 2010 from Champion Technologies in Houston, Texas where he was Director of Research and Development. Johann received his Ph.D. in Organic Chemistry from the University of Port Elizabeth, Republic of South Africa and is the recipient of numerous fellowships, scholarships and honors. He is a native of South Africa and worked previously for the Atomic Energy Corporation of South Africa. Dr. Venter has extensive experience and expertise in industrial chemistry including process and product development, as well as pilot plant design, operation and scale-up.

Jean Pougnier​
Vice President, Business Development and Marketing​
Jean has 36 years of experience with DuPont, 24 years of which were in the agrochemical sector in the areas of Business Development, Finance and Strategy, culminating in the position of Global Business Director. Over the course of his career, Jean has conducted multiple acquisitions and divestitures, led initiatives to make significant portfolio additions, negotiated cutting edge licensing agreements, and strengthened reporting processes for financial information and major product lines. Jean has a BS in Economics with an emphasis in Accounting from Clemson University and an MBA from the University of Chicago.

John Rizzi
Vice President and Director of Manufacturing
John Rizzi is responsible for the operation of all of AMVAC’s manufacturing facilities and is involved in the procurement of key materials from outside manufacturers and suppliers. His 28-year manufacturing career includes extensive experience with safe start up and commissioning, continuous improvement, maximizing manufacturing output and handling of hazardous materials. Mr. Rizzi has worked throughout the U.S., Canada, Australia and New Zealand and has previously served as Plant Manager of AMVAC’s Axis, Alabama facility since it was acquired in 2001. He has undergraduate and masters degrees in chemical engineering from McGill University in Montreal, Canada as well as a Certificate in Business Studies from Waikato University, New Zealand.

Anne Turnbough, Ph.D.
Vice President of Regulatory Affairs
Anne has nearly two decades of experience in managing regulatory compliance for a broad range of pesticides, 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 U.S. EPA, successfully obtained and defended numerous new product and use registrations, and built processes and teams to ensure the highest level of compliance globally.

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 realtions 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.