Bristol Myers Squibb announced Cristian Massacesi, former AstraZeneca CMO, as its new chief medical officer starting August 1. Massacesi replaces Samit Hirawat amid Bristol Myers’ pipeline expansions and looming patent cliffs. Separately, Llusern Scientific appointed new executives including Bob Yang as chief medical officer, signaling strategic growth. Additional leadership shifts include various hires and promotions across biopharma and med-tech sectors reported on July 25, reflecting ongoing industry evolution and talent repositioning.