Summerhill, a Chicago native, began his collegiate career at Triton College, where he finished seventh in the nation in batting average and eleventh in slugging percentage. His performance earned him NJCAA Second-Team All-American honors. He later transferred to Troy for one season before finishing his college career at Northern Illinois. 

As a Husky, Summerhill thrived offensively. In 2023, he drove in more than 50 RBIs—something no NIU player had accomplished since 2004. In 2024, the 24-year-old shattered the program’s single-season home run record by hitting 19. He led the team with 65 RBIs and was named to the All-MAC Second Team. 

After wrapping up his college career, Summerhill signed his first professional contract with the Los Angeles Angels and made his pro debut in April 2025 with the Inland Empire 66ers. Across 108 games with Inland Empire and the Tri-City Dust Devils, he recorded 25 doubles, 40 RBIs, and six home runs.