Pepiot was born in Indianapolis, Indiana, and grew up in Westfield, Indiana, where he attended Westfield High School and played baseball, basketball, and football. In football, he was named Class 5-A All-State at quarterback as a senior.[1]
The Los Angeles Dodgers selected Pepiot in the third round of the 2019 MLB draft; he became the highest-drafted Butler player in program history.[5] Pepiot signed with the Dodgers and was initially assigned to the Arizona League Dodgers before being promoted to the Class-A Great Lakes Loons of the Midwest League. He finished the season with 13 appearances (10 starts) between the two levels, recording no decisions with a 1.93 ERA and 31 strikeouts in 23.1 innings pitched.[6] Pepiot was named to the Dodgers' 2021 Spring Training roster as a non-roster invitee.[7][8] He began the 2021 season with the Double-ATulsa Drillers, where he went 3–4 with a 2.87 ERA, 0.94 WHIP, and 81 strikeouts over 59+2⁄3 innings pitched before being promoted to the Triple-AOklahoma City Dodgers.[9] In his 11 games (nine starts) for Oklahoma City, he was 2–5 with a 7.13 ERA.[10]
Pepiot began 2022 with Oklahoma City, where he started the season 2–0 with a 2.05 ERA in six starts with 36 strikeouts before he was promoted to the major leagues on May 11 to make his debut as the starting pitcher against the Pittsburgh Pirates on May 11, 2022.[11] He struck out the first batter he faced, Ben Gamel, for his first MLB strikeout and pitched three scoreless innings with one hit, a hit batter and five walks while striking out three.[12] On July 5, Pepiot picked up his first major league win against the Colorado Rockies.[13] He pitched in nine games for the Dodgers, making seven starts, and finished with a 3–0 record and 3.47 ERA.[14] He also made 19 appearances (17 starts) for Oklahoma City on the season and was 9–1 with a 2.56 ERA.[10]
Pepiot was expected to open the 2023 season in the Dodgers starting rotation but strained his left oblique in his final spring training start and instead began the season on the injured list.[15] After a few minor league starts, he rejoined the Dodgers on August 19.[16] He made three starts and five "bulk" relief appearances, for a 2–1 record and 2.14 ERA.[14]