Klaas began his farming career as a conventional grower in the 1970s. He and his partner, Mary-Howell, began to transition their farm in the early 1990s. Klaas and Mary-Howell now farm 1,400 acres of certified organic crops and operate Lakeview Organic Grain, a certified organic feed and seed business. They are frequent speakers at conferences and have written extensively on organic farming. Organic research is a strong component of their farming operation. They have conducted on-farm research independently and in cooperation with university researchers.