Personal
- Parents are Brad and Haley Guinn
- His grandfather played at Ricks College from 1961-63
- An Eagle Scout
- Served a mission for The Church of Jesus Christ of Latter-day Saints in Mexico
Before BYU
- Played his freshman season at UC Riverside in 2012-13
- Played in 20 games and started 4
- Averaged 4.4 points, 3.3 rebounds and added 8 assists, 3 blocks and 8 steals
- A three-year letter winner for Kurt Ruth and Andy Rucker at Vista Murrieta High School
- A two-time first-team All-League selection and first-team All-Valley selection
- First-team All-CIF as a senior and second-team All-CIF as a junior
- Vista Murrieta's all-time leading scorer
- Averaged 23.3 points and 9.3 rebounds as a senior
- Also ran track
- Three-time Academic All-League