Pleasant Valley State Prison (PVSP) reported the passing or retired Correctional Sgt. Thomas S. Trees Jo. On March 10, 2018.

He began his CDCR career in August 1987 when he reported to the Richard A. McGee Correctional Training Center as a cadet.

In October 1987, he reported to Avenal State Prison as a Correctional Officer. In October 1994, he transferred to PVSP.

He promoted to a Correctional Sergeant at PVSP in June 1995. In April  2002, he accepted a limited term position at Substance Abuse Treatment Facility (SATF) as a Correctional Lieutenant.

In September 2002, he returned to PVSP as a Correctional Sergeant, where he remained until his retirement in August 2007.