Personal
- Parents are David and Leslie Hartsock
- Wife Kendalyn plays volleyball at BYU
- Served a mission for The Church of Jesus Christ of Latter-day Saints in Salt Lake City
- Has five brothers and one sister
- Brother Nate played two seasons at Oklahoma Wesleyan University and brother Jeremiah played at the University of Missouri-Kansas City
- Sister-in-law Lindsy Hartsock was a middle blocker for the BYU women's volleyball team and was the MWC Player of the Year in 2006
- Also recruited by Utah State and Oklahoma State
Before BYU
Bartlesville High School
- McDonald's High School All-America nominee
- Averaged 27.6 points per game as a senior at Bartlesville High School and was the third-highest scorer in the state of Oklahoma and the highest in the 6A division
- Led the Bruins in rebounds with 8.0 per game while recording 100 blocks in 27 outings
- Named all-state by the Tulsa World and was recipient of the KTUL-TV Elite 8 Champions Award as the best boys basketball player in his area
- Oklahoma Tipoff Magazine Fab 5 pick
- Scored 32 points and pulled down 10 rebounds in BHS loss to Union in the Frontier Conference title game
- Went 10-for-13 from the field and 11-of-12 from the free-throw line to score 31 points while playing ill in the area consolation playoffs, leading BHS to a 50-37 win over Memorial and a berth in the state championships
- Scored 36 of the Bruins 49 points in a state quarterfinal loss to eventual-champion Putnam City
- Selected to play on the Large East team in the Oklahoma Coaches Association All-State game
- Averaged 19.9 points and 9.9 rebounds per game as a junior, helping the Bruins finish 25-3 and advance to the state championship game
- Named the Frontier Conference Player of the Year and first-team all-state
- Also went to the state championships as a sophomore, his first year with the varsity team
- Received several tournament MVP awards for his play with the Oklahoma Adidas Pump and Run team