Bayhealth, a two-hospital system based in Dover, Del., has appointed Mike Tretina as senior vice president and CFO.<br /><br />Mr. Tretina previously was CFO of Mary Greeley Medical Center, a 220-bed, city-owned hospital in Ames, Iowa, for more than four years. He helped build MGMC's cash on hand to more than 500 days during his tenure. He also served as senior vice president of finance at St. Vincent's HealthCare in Jacksonville, Fla.<br /><br />Bayhealth is the second-largest health system in Delaware.