A native of Corvallis, Oregon, Seumalo attended Corvallis High School, where he won 5A First-team All-State honors as an offensive and defensive lineman his junior and senior years. He had transferred there from Santiam Christian School, where he played his freshman and sophomore years. Regarded as a four-star recruit by Rivals.com, Seumalo was listed as the No. 3 offensive guard prospect in his class.[1] He chose Oregon State, where his father Joe Seumalo worked as defensive line coach, over offers from Oregon, Stanford, and Southern California.[2] Seumalo had been working out in the summer on Oregon State's campus.[3]
In 2018, Seumalo entered the season as the backup left guard behind Stefen Wisniewski. He was named the starter in Week 5 and started the next nine games before being sidelined the final three weeks of the regular season with a pectoral injury.
On March 4, 2019, Seumalo signed a three-year contract extension with the Eagles through the 2022 season.[13]
On September 22, 2020, Seumalo was placed on injured reserve with a knee injury.[14] He was activated on November 20, 2020.[15]
On September 28, 2021, Seumalo was placed on injured reserve after suffering a Lisfranc injury in Week 3.[16]
During the 2022 season, Seumalo helped the Eagles reach Super Bowl LVII but lost 38–35 to the Chiefs.[17]
On March 18, 2023, Seumalo signed a three-year, $24 million contract with the Pittsburgh Steelers.[18] In his first season with the Steelers, he started all 17 regular season games. He would also record another postseason appearance when the Steelers lost 17-31 to the Buffalo Bills in the AFC Wild Card playoff game.[19]
During a preseason practice, Seumalo sustained a pectoral injury that would keep him from seeing the field for the first four weeks of the 2024 regular season.[20] He would return to the team's starting lineup during the team's Week 5 primetime loss to the Dallas Cowboys.
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