Isermeyer studied agricultural sciences at the Georg-August-Universität Göttingen from 1978 to 1982 and received his doctorate there in 1987. He stayed as a research assistant at the university until 1990 and then moved to the Institute for Business Administration at the Federal Research Center for Agriculture (FAL) (until 2007) and the Thünen Institute (2008 to 2009). In 1996 he became an honorary professor at the Georg-August University. In 1998/99 he was President of the FAL. He has been President of the Thünen Institute since 2009.
Isermeyer has been a member of the Bioeconomy Council (BÖR) since 2009 . Since 2015 he has been chairman of the advisory committee of the animal welfare industry initiative and from 2014 to 2016 was a member of the animal welfare competence group  at the Federal Ministry of Food and Agriculture (BMEL). He was a member of the Scientific Advisory Board for Agricultural Policy at the BMEL and its chairman from 2003 to 2011.
- BMEL - Animal Welfare Initiative of the BMEL - Animal Welfare Competence Group accompanies the Animal Welfare Initiative. In: www.bmel.de. Retrieved December 27, 2016 .
|SHORT DESCRIPTION||deutscher Agrarökonom|
|DATE OF BIRTH||5th January 1958|
|PLACE OF BIRTH||Braunschweig|