Bristol Myers Squibb has appointed Cristian Massacesi, M.D., former AstraZeneca Chief Medical Officer, as Executive Vice President, Chief Medical Officer, and Head of Development, effective August 1, 2025.
Massacesi replaces Samit Hirawat, who led Bristol Myers' development efforts for six years and oversaw the launch of blockbuster drugs including Reblozyl, which generated nearly $1.8 billion in revenue in 2024.
The leadership change comes as Bristol Myers faces significant challenges from generic competition for Revlimid and looming patent expirations for key drugs Opdivo and Eliquis.
Massacesi brings over 20 years of biopharmaceutical experience and previously led AstraZeneca's global organization of more than 3,000 employees, advancing over 150 clinical studies and securing multiple regulatory approvals.