After graduating from Maranatha High School, in Pasadena, California, he played college basketball for the Oregon Ducks.

In his senior year, he decided to transfer to Maranatha, due to his desire to return to his hometown of Pasadena.

Oregon earned the top seed in the West region, and went as the number one team of their conference into March Madness.

On August 17, 2019, Dorsey joined Maccabi Tel Aviv of the Israeli Premier League and the EuroLeague, signing a one-year deal with an option for another one.

[11] On November 1, 2019, Dorsey recorded a EuroLeague career-high 19 points, shooting 7-of-12 from the field, along with four rebounds, three assists and two steals in a 90–65 win over Olympiacos.

[12] On August 20, 2021, Dorsey joined Olympiacos of the Greek Basket League and the EuroLeague, signing a one-year deal.

[18] On March 1, 2023, Dorsey signed with Turkish powerhouse Fenerbahçe through 2025, joining his Greek national team coach Dimitrios Itoudis, as well as his teammates Nick Calathes and Kostas Antetokounmpo.

[19] On June 30, 2024, Dorsey signed a three-year contract with Olympiacos, returning to the club after two seasons.

The next year, before the 2015 FIBA Under-19 World Cup began, he was invited to Greece's Under-19 national team tryout camp, for which he was eligible due to his mother's Greek family.

On June 6, 2016, Dorsey was named to the senior men's Greek national basketball team's 16-man preliminary training camp roster for the 2016 Turin FIBA World Olympic qualifying tournament.

He played with the senior team in 3 friendly games, however, he did not make the actual 12-man roster that would compete at the tournament.

In September 2023 FIBA was naturised Tyler,so he was not picked up for Greece's roster for 2023 Basketball World Championship.