Petersen was born in London to a white American father and Nigerian mother.[1][2][3] At age one,Petersen moved to California,his father's home state.[2] Petersen grew up in San Jose and attended Saint Francis High School.[4]
After one year at West Valley,Petersen transferred to Riverside City College,playing one game in the 2014 season,for 1+1⁄3 innings pitched, two strikeouts, and no runs allowed.[6]
Petersen was claimed off waivers by the Colorado Rockies on December 12, 2019[8] He did not play in 2020 as a result of the cancellation of the minor league season because of the COVID-19 pandemic and missed the 2021 season after undergoing Tommy John surgery on May 5, 2021.[9][1] While rehabbing from his injury, he made only one appearance in 2022 (in the Arizona Complex League)[1] before splitting the 2023 season between the Double-A Hartford Yard Goats and Triple-A Albuquerque Isotopes, with a combined 41 games and 4.10 ERA.[5]
Los Angeles Dodgers
Petersen signed a minor league contract with the Los Angeles Dodgers on January 24, 2024, and began the season with the Triple-A Oklahoma City Baseball Club.[8] On June 16, Petersen was selected to the 40-man roster and promoted to the major leagues for the first time.[10] He made his MLB debut two days later against the Rockies, allowing one run on one hit and one walk while striking out two in two innings to pick up the win. His first strikeout was of Elehuris Montero.[11] He pitched 14 innings over 11 games for the Dodgers, with three wins, a 6.43 ERA, and 11 strikeouts.[12] Petersen also appeared in 35 games for Oklahoma City, with a 1.64 ERA, 10 saves, and 44 strikeouts.[5] He was designated for assignment by the Dodgers on September 8.[13]
Miami Marlins
On September 10, 2024, Petersen was claimed off waivers by the Miami Marlins.[14] In 5 appearances for the Marlins, Petersen logged a 4.76 ERA with 3 strikeouts across 5+2⁄3 innings pitched.
Los Angeles Angels
On November 4, 2024, Petersen was claimed off waivers by the Toronto Blue Jays.[15] He was designated for assignment following the signing of Max Scherzer on February 4, 2025.[16] On February 11, Petersen was claimed off waivers by the Los Angeles Angels.[17] He was optioned to the Triple-A Salt Lake Bees to begin the season.[18] Petersen made one appearance for Salt Lake before he was designated for assignment on March 31.[19]
Atlanta Braves
On April 1, 2025, Petersen was traded to the Atlanta Braves in exchange for cash considerations.[20] In four appearances for the Braves, he accumulated a 4.05 ERA with five strikeouts across 6+2⁄3 innings pitched. Petersen was designated for assignment by Atlanta on July 13.[21]
Miami Marlins (second stint)
On July 16, 2025, Petersen was traded to the Miami Marlins in exchange for cash considerations.[22]
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