Myriad Genetics (MYGN) said late Monday it has named Chief Operating Officer Sam Raha as chief executive and president, effective April 30, succeeding Paul Diaz.

Diaz, who is leaving to become a managing partner at private-equity firm Cressey, will continue serving as consultant to Raha.

Myriad said that Chief Commercial Officer Mark Verratti will be promoted to COO and that it will hire a new chief commercial officer.