Sangart Inc.'s CEO Brian O'Callaghan first took on his C-level responsibilities at the age of 30 for a division of Merck Serono, but it wasn't official for two years because of his young age. "Investors thought at 30 years it was too big a risk for the CEO title," O'Callaghan told BioWorld Today. After 11 years, O'Callaghan has grown into the executive leadership position he took on so early.