He made his MLB debut in 2021 with the Phillies and has also played for the San Francisco Giants, Miami Marlins, and Los Angeles Dodgers.

He attended Dana Hills High School (2015), where he played baseball and football (as a starting wide receiver and defensive back) and was a sprinter on the track team, competing in the 100-meter dash and the 4 × 100 meters relay.

[13][14] Williams spent the 2016 season with the Low-A Williamsport Crosscutters, playing third base and slashing .220/.297/.301 with 2 home runs, 11 steals (while being caught twice), and 18 RBIs in 186 at bats.

[15] Williams spent the 2019 season with the Reading Fightin Phils of the AA Eastern League and batted .238/.319/.395 with 77 runs scored (2nd in the league), 30 doubles (2nd), 51 RBIs, 5 sacrifice flies (8th), and 44 extra base hits, along with 30 stolen bases (4th) while being caught 9 times, in 441 at bats.

[15] Williams was named the best overall athlete in the Phillies' minor league system going into the 2021 season and was assigned to the Class AAA Lehigh Valley IronPigs.

[22] Williams received his first major league call-up on June 8, 2021, to take the place of a struggling Nick Maton.

[23] He debuted with the Phillies that same day, filling in as a pinch hitter for starting pitcher Aaron Nola in the fifth inning of a game against the Atlanta Braves.

[24] The following day, in his first MLB start, Williams hit a two-run walk-off home run in the bottom of the ninth inning, lifting the Phillies to a 2–1 victory over the Braves.

[27] On March 27, 2022, Williams was traded to the San Francisco Giants in exchange for infielder Will Toffey and cash.

[13] On June 5, 2023, Williams was claimed off waivers by the Atlanta Braves and subsequently assigned to the Gwinnett Stripers.

[38] In May 2021, Williams was named to the roster of the United States national baseball team for the qualifying tournament for the 2020 Summer Olympics.

He was inspired to take on a "super-utility" role after learning that Ben Zobrist spent 14 years in MLB while playing whatever position was asked of him.