The letter did not expand on where Dunn will be heading, saying only that he left to "explore other opportunities." Taking his place on an interim basis will be Teresa Buracchio, M.D., who was recently permanently appointed to be deputy head of the neuroscience unit. Fierce Biotech Former Celgene pres tapped to lead Viatris Viatris Viatris is reading a changing of the guards atop its leadership ranks, with former Celgene vet Scott Smith ready to take the helm from CEO Michael Goettler. Smith has most recently been president of BioAtla, but gained prominence earlier in his career at now Bristol Myers Squibb-owned Celgene. After working in Celgene's immunology and inflammatory units, he was promoted to president and chief operating officer in 2017. He abruptly left a year later.