Mercy Sister Mary Susan Thomas, 95, died Dec. 14.

Born in Oak Park, she entered the Sisters of Mercy in 1944 determined to be a nurse. 

After receiving her nursing degree, Sister Susan first worked in direct patient care on the surgical floor, then went on to teach and supervise, eventually becoming an administrator. 

For nearly 30 years, she ministered at Mercy Hospitals in Chicago and Aurora, Illinois; in Iowa; and in Wisconsin.

In 1971, she began serving as a USA surveyor for the Joint Commission of Accreditation of Hospitals, located in Chicago. In this position, she was part a team of experts who accredit and certify more than 21,000 healthcare organizations and programs in the United States. 

In 1975, she transferred to the Illinois State Department of Public Health, where she worked in staff development. She retired from that position in 1989, and started a 17-year career as a volunteer communication consultant for the Diocese of Springfield, Illinois. She moved to Mercy Circle in Chicago in 2014.