Timo Flessner, Senior Vice President, has broad operational and senior management experience in pharmaceutical R&D, manufacturing & Product Supply.

Since June 2024 he takes the role as the Manufacturing API & Medical Devices Lead at Bayer Pharma Product Supply. The portfolio in API and MD manufacturing, is rich in diversity and complexity, spans across 11 global sites. MD adds to his former responsibility and brings new challenges as change, fostering collaboration, and setting new benchmarks in the supply of active pharmaceutical ingredients and a diverse portfolio of medical devices.

Since October 2020 he took responsibility for the Global API (Active Pharmaceutical Ingredient) Product Supply organization. The main focus is on API supply for clinical studies as well as launch & the longer-term commercial life-cycle of a broad product portfolio.

In the previous role he was the Site Manager for the Pharma site in Wuppertal - which is the founding place of Bayer & includes Pharma R&D and API Product Supply operations. Before he was the Site Manager for the Bayer Supply Center Bergkamen as well as the Supply organization in Berlin-Charlottenburg. Before moving into the site manager responsibilities he was heading Global Chemical Development with a focus on the development of chemical & technological processes to ensure API supply concepts & security for preclinical, clinical studies, submission & launch.

From 2000-2011 he held various positions of increasing responsibility in Bayer´s / Bayer HealthCare’s Global Drug Discovery (Head of chemistry labs, Chief of staff for PH Research and PH R&D, Director & Head of a Medicinal Chemistry Department).

In addition to his responsibilities at Bayer he is a non-executive advisor for start-up companies and a lecturer at the University of Hannover since 2015 (Making Drugs: Research, Development & Industrialization of API). His strong ambition for sustainability drove him into a supporter role for the Circular Valley initiative. In an additional assignment he is a member of the board of the GDCh (2016-2024). Apart from the professional level he is active in voluntary work, e.g. in an initiative in Wuppertal that supports the city & people in need. He is married and a proud father of two sons.

He holds a PhD in Chemistry. He was educated at the Universities of Oldenburg, Hannover and Paris-Sud (Diploma in Chemistry). He received his PhD with Prof. E. Winterfeldt in 1999 from the University of Hannover. He worked as a Postdoc in the group of Prof. C.-H. Wong at the Scripps Research Institute in San Diego.