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Management Team
Chief Executive Officer
John Castle
John Castle has served in a number of financial leadership positions, including most recently in the ethanol industry as the Senior Vice President of Operations, Chief Financial Officer and Secretary of White Energy. Before joining White Energy, Mr. Castle was director of accounting for Dresser, Inc., global manufacturer of highly engineered energy infrastructure and oilfield products. Mr. Castle has held financial executive positions as Chief Financial Officer at Rohn Industries, as well as the Vice President-Treasurer and Corporate Controller of Telxon Corporation. Mr. Castle has also held accounting and financial management positions at Mosler, Inc., Western Atlas Inc. and at Litton Industries Inc. Mr. Castle is a Certified Public Accountant with a master's degree in business administration from Xavier University and a bachelor of science in accounting from Eastern Illinois University.
Chief Financial Officer
Calvin Stewart
Mr. Stewart became our Chief Accounting and Compliance Officer in November 2010. Prior to joining the Company, Mr. Stewart served as Chief Financial Officer of White Energy, Inc., an ethanol production company. Before joining White Energy, Mr. Stewart served as Manager, Technical Accounting and Sr. Manager, Corporate Accounting, at Dresser, Inc., a global manufacturer of highly engineered energy infrastructure and oilfield products and services. Previously, Mr. Stewart was Manager, Accounting and Finance, at Siemens Maintenance Services. Mr. Stewart also served as Plant Operations Controller and Director of Accounting and Finance for Morningstar Foods, a national leader in dairy food and beverage manufacturing and distribution. Mr. Stewart is a Certified Public Accountant with a Masters of Business Administration from Southern Methodist University’s Edwin L. Cox School of Business and a Bachelor of Science in Finance, cum laude, from Towson University.
Senior Vice President, Commodity Risk Management
Benjamin Borgen
Mr. Borgen has extensive experience in the biofuel and agribusiness sector including trading, marketing, and logistics of ethanol and associated agricultural and soft commodities. Prior to joining Aventine Mr. Borgen has built and managed ethanol trading and marketing groups as Director of Ethanol Trading and Marketing for Barclays Capital and as Vice President of BioFuels Trading and Marketing for Sempra Energy Trading. In these positions Ben has been responsible for strategy development and evaluation, asset evaluation, and management of commodity positions. Ben has a broad range of experience trading Ethanol, Corn, RBOB Gasoline, Crude Oil, and Sugar using physical and financial instruments including swaps, futures, options, and cross commodity hedges. Ben holds a Bachelor of Arts degree from Concordia College in Moorhead, Minnesota.
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