Trumbo became the first head coach of the beach volleyball team in 2016. He also serves as the women's indoor volleyball head coach.
Trumbo has successfully built the women's beach volleyball program, the first in Division III, into one of the top small-college programs in the country. In 2018, the Mustangs finished second at the inaugural AVCA Small College National Championship, while they posted the first-ever win over a Division I opponent, topping Morehead State.
In 11 seasons under Trumbo's guidance, Stevenson's indoor women's volleyball program has totaled 312 wins, 17 All-Americans, 37 All-Conference selections, three Player of the Year selections, three Rookie of the Year selections, nine postseason appearances, including seven straight appearances in the NCAA Division III Women’s Volleyball Championship from 2011-17, while setting the school record with 37 wins in 2013. In 2017-18, Stevenson finished with a 33-2 overall record and ranked No. 23 nationally in the final AVCA poll after climbing as high as No. 15 during the season. The Mustangs hosted an NCAA regional for the first time after capturing their sixth straight MAC Commonwealth title, and reached the second round. Senior Annika Schwartz became the program's first-ever AVCA First Team All-American.
Prior to Stevenson, Trumbo started the girls' volleyball program at Liberty High School in Sykesville. During his tenure, Trumbo led the Lions to Class 2A state titles in 2003 and 2004, as well as nine county championships and six regional titles in 11 seasons.
Trumbo totaled a 167-31 career record, including a metro-area record 49-match winning streak, and was named Metro Coach of the Year in 2003. He was also a five-time Carroll County Coach of the Year in 1999, 2001, 2002, 2003 and 2004 and coached seven players who were named Carroll County Player of the Year and one Metro Player of the Year.
The founder of the "Spike It!" Volleyball Camp, Trumbo also coached girls basketball at Liberty, leading the Lions to county championships in 1998 and 1999.
Off the court, Trumbo has worked for WTTR radio as a color analyst for McDaniel basketball games and the Carroll County High School Basketball Game of the Week. He has also served as a color analyst at Adelphia Cable Television for the Carroll County High School Basketball and Lacrosse Game of the Week and prepares and edits segments of a quarterly publication which reaches 50,00 subscribers.
Trumbo received a bachelor of science degree in physical education from Towson in 1976 and a master of science in recreation administration and supervision from Morgan State. While at Towson, he participated in both soccer and baseball.
Trumbo's wife, Fran, is a college field hockey and women's lacrosse official and the couple has three children, Michael, Becky and Bryan. Michael is a Stevenson graduate who ran cross country for the Mustangs.
Becky was an All-American lacrosse player at Towson from 2003-06 and is currently the head girls' lacrosse coach at Century while Bryan, who also graduated from Towson and boasted a 4.0 grade point average, is the head girls' volleyball coach at Century.