Top 25 COOs in Healthcare - 2018

Hazen serves as a president and COO of HCA Healthcare. He oversees operations that include 171 hospitals, 118 ambulatory surgery centers, and numerous outpatient facilities and physician practices across 42 domestic markets and in the United Kingdom. A 35-year veteran of HCA, Hazen has served in various senior positions such as president of operations from 2011 to 2015. He also served as president of HCA's Western Group, which included all operations west of the Mississippi River and represented about half of the company's revenue. He was named COO in 2015 and added the president title a year later. HCA in March signed a letter of intent to acquire six-hospital Mission Health, based in Asheville, N.C.