Major Lang began his career with the Oklahoma Highway Patrol on June 1, 2000, as a member of the 52nd Patrol Academy. After graduating from the Academy, he was assigned to Troop I, Beaver County. In February of 2001, Lang was transferred to Troop F, Carter and Love Counties. On March 1, 2002, Lang received an Additional Duty assignment as a Tactical Team member. Lang became a Defensive Tactics Instructor in 2002 and a firearms Instructor in 2004. Lang spent 6 years in Troop F before transferring to Troop G, Grady County late in December of 2007. In 2009 Lang received an intra troop transfer to Stephens and Jefferson Counties within Troop G. In 2013 Lang transferred to Troop A, Oklahoma County. January 1, 2015, Lang was promoted to Lieutenant assigned to Troop A Metro. On July 1, 2016, Lang was transferred to the Training Division as a Lieutenant over the Defensive Tactics program. On November 1, 2018, Lang was promoted to the rank of Captain and was assigned as the Troop Commander of Troop J/Enid. September 1, 2021, Lang was assigned as the Troop Commander of the Capitol Park Complex. In September of 2021 Lang was also given an additional duty assignment as the Troop Commander of the Emergency Services Unit. In April of 2022 Lang was transferred to the Training Division as the Troop Commander and remained as the Commander of ESU. Lang remained the Troop Commander of the Training Division and the Emergency Services Unit until being promoted to the rank of Major on September 1, 2022.
Lang had held four positions on the OHP Tactical Team, including a entry team member, Sniper, Assistant Team Leader, Assistant Commander as a Lieutenant and a Captain, and the Commander of the Tactical Team. Lang was assigned as a Tac Officer in the 55th, 56th, and 57th patrol schools, and Tac Supervisor in the 64th, 65th, Patrol Schools.
Lang has a wife Christina, son Hudson, and daughter Isabella.