|Title:||Assistant Head Coach/Defensive Coordinator/ Defensive Line|
|College:||Western Michigan, 1978|
Denny Doornbos is in his fourth season on The Citadel coaching staff and was promoted to assistant head coach in 2011. In March 2012 he added the duties of defensive coordinator while continuing to mentor the defensive linemen.
A season ago defensive end Chris Billingslea concluded his outstanding Citadel career by being named second-team All-Southern Conference for the second straight season. Under Doornbos' direction Billingslea finished his career with 29.5 tackles for loss and 13 sacks to rank among the school leaders in both categories.
In 2011, two of his pupils - Billingslea and tackle Derek Douglas - were named to the All-Southern Conference team, with Douglas earning first team accolades after ranking fifth in the league with 14.5 tackles for loss.
Doornbos came to The Citadel from St. Norbert College where he was the defensive coordinator. In his lone season on the staff in 2009, the Green Knights posted a record of 9-1, finished second in their conference in total defense and recorded two shutouts, the first at St. Norbert since 1952.
Prior to his stay at St. Norbert, Doornbos spent five seasons at Northern Illinois. He coached the linebackers in 2003 before being promoted to defensive coordinator the following year and staying in that role through the 2007 campaign.
In 2003 Northern Illinois became the first Mid-American Conference team to defeat three BCS schools en route to a 10-2 record. The following year the Huskies went 9-3 and won the Silicon Valley Bowl. The team won a second straight MAC Western Division title and led the conference in scoring defense in 2005 and earned a berth opposite TCU in the Poinsettia Bowl following the 2006 season.
Doornbos, who has over 30 seasons of coaching experience, spent 13 years at Army (1986-99) and was defensive coordinator and defensive ends coach for nine. He was the defensive coordinator at UTEP from 1983-85 and also spent time on coaching staffs at Michigan (1982), Kent State (1981), Boston College (1980) and Illinois (1978-79).
Doornbos received his bachelor of science degree from Western Michigan in 1978 and was a defensive back for the Broncos. He and his wife, Helen, have two sons: Blaik and Darik.