A 1991 graduate from Wapsie Valley High School in northeast Iowa, Dettmer had originally planned on being an FBI agent.
He went to Buena Vista University to get his bachelor's degree, then went on to get a master's and then a Ph.D. in developmental psychology.
He has taught math and science at Seymour and history in Alta. He has also coached, including head girls' basketball at Seymour and head softball coach at Alta and Seymour. He was assistant women's basketball coach at BVU.
He has worked at the Civil Commitment Unit for Sexual Offenders at the Mental Health Institute campus in Cherokee.
"I really enjoy teaching and love to coach," Dettmer said. He is teaching seventh grade geography and high school economics. He is also the head girls basketball coach and head softball coach.
Dettmer will spend most of his teaching time in the middle school, which is how he likes it. He says that middle school kids are more relaxed about things, without all the pressing problems that the high school kids have.
"Every school system is a little different and I've been really pleased with the help I've gotten in adjusting to the school here," Dettmer said.
He said he might become a school counselor some day.
He and his wife, Amy, have three children. Madison is 9, Brayden is 6 and Reece is 8 months. They also have two foster children. Amy operates day care from her home.