Kugler got his first professional coaching experience in 2001 as a tight end coach with the Detroit Lions of the NFL. He later worked his way into a role as offensive line coach in 2004.
In 2006, Kugler moved to Boise State, assuming a role as assistant head coach and offensive line coach. The 2006 Boise State Broncos football team was the only undefeated team in college football that year, winning the WAC title and beating Oklahoma in the 2007 Fiesta Bowl. They boasted the sixth-ranked rushing performance in the nation behind Kugler's offensive line led by sophomore Ryan Clady and junior Jeff Cavender, who earned All-WAC honors.
Second NFL stint
Kugler joined the Buffalo Bills in 2007 as assistant offensive line coach. He was promoted to offensive line coach the following year. He quickly improved the Bills' line and mentored tackle Jason Peters to two consecutive Pro Bowl selections. Kugler’s units blocked for three consecutive 1,000-yard rushers: Marshawn Lynch and Fred Jackson. The Bills' offensive line became remarkably consistent and cohesive, surrendering only 26 sacks on the 2007 season and consisting of the same lineup for 15 consecutive games. He joined the Pittsburgh Steelers in 2010 following the dismissal of the previous offensive line coach, Larry Zierlein. He had previously replaced Zierlein as assistant line coach for the Bills in 2007. In his first season as a coach with the Steelers, the team made it to the Super Bowl despite season-ending injuries to both starting offensive tackles and the presence of a rookie starting center. Center Maurkice Pouncey made his first three Pro Bowls under Kugler from 2010-12.
UTEP
On December 10, 2012, UTEP named Kugler as the new head coach, replacing the retired Mike Price. In addition to leading the Miners to the New Mexico Bowl in 2014, Kugler’s team achieved a perfect APR academic score of 1,000 and had the highest GPA and graduation rates in school history. Kugler coached two All-Americans—running back Aaron Jones and guard Will Hernandez—while at UTEP. He resigned during the 2017 season after an 0-5 start.
Denver Broncos
Kugler was hired by the Denver Broncos on January 2, 2018 to be the offensive line coach.
Arizona Cardinals
On January 13, 2019, Kugler was hired by the Arizona Cardinals to be their offensive line coach.
Personal life
Kugler has three children: sons Robert and Patrick and daughter Kali, and a stepson, Javi, with wife Monica. Robert and Patrick played on high school football teams that won state championships two straight seasons — in 2009 in New York and 2010 in Pennsylvania. Robert was named the Class AAAA co-Player of the Year by the Pennsylvania Interscholastic Athletic Association, and played college football for the Purdue University Boilermakers from 2011 to 2014, including two seasons as their starting center. His younger son, Patrick, is an offensive lineman for the University of Michigan Wolverines.