Francisco Leon

Francisco Leon, MD, PhD, is the Founder and CEO of Tolerance Bio, a biotech start-up focused on increasing healthspan by restoring and preserving the function of the thymus, a key regulator of immune tolerance.

Francisco is a clinical and basic immunologist with a long career in academia (NIH), pharma (BMS, MedImmune/AZ, Janssen/JNJ) and as an entrepreneur - as CEO, CMO and CSO of several companies.

He has led or participated in the development of 6 drugs which reached the market, and has co-founded and sold two biotech companies: Celimmune, acquired by Amgen in 2017, and Provention Bio, acquired by Sanofi in 2023.