JoAnn Kunkel. CFO of Sanford Health (Sioux Falls, S.D.). As Sanford Health's CFO, Ms. Kunkel oversees finances for one of the largest health systems in the country, with 45 hospitals and nearly 300 hundred clinics. She joined Sanford Medical Center in 1995 and was appointed CFO of the system in 2012. Sanford Health has 28,000 employees with more than 1,300 physicians.