From 1999 to 2016, Herrmann held various positions at Monsanto Company and its subsidiaries including as Vice President North America Vegetable Seed, Vice President US Technology Development and Licensing, President of Corn States LLC, Director Eastern US and Director Monsanto US Seed and Trait Business. Herrmann joined the Monsanto Company through the acquisition of DEKALB Genetics Corporation in 1998, where he began his career in the seed business in 1984 with leadership roles in sales, sales management, marketing and product management. Since January 2021, Herrmann has served as president and founder of Acumen Seed Executive Consulting LLC.