He played sparingly for the Internationals during the 2007 PDL season, making just two appearances[7] as the club finished sixth in the Great Lakes Division, 12 points outside of the playoff positions.

He scored once in 13 appearances during the regular season,[8] as the Internationals placed second in the Great Lakes Division and qualified for the playoffs for the only time in club history.

Williams saw action in both playoff games, picking up a yellow card in the Divisional Round victory over Toronto Lynx.

He appeared 11 times for the club,[10] but could not prevent the Internationals from finishing at the bottom of the Great Lakes Division, with just eight points from 16 games.

Williams went on trial with MLS club Kansas City Wizards in the spring of 2010,[2] and appeared for the reserve team of Columbus Crew in a match against Marshall.

In June 2011, Williams was suspended for 10 games and fined 10% of his salary after testing positive for methandienone metabolites, a performance-enhancing drug.

Williams did not make an appearance for Columbus in any competition, and was left unprotected for the 2011 MLS Expansion Draft,[16] but was not selected and thus returned to the Crew for the 2012 season.

From a Federico Higuaín free kick, Williams powered home a 41st-minute header that helped Columbus to a 2–1 victory on the day.

[19] Williams finished the season with 31 appearances for Columbus across all competitions, splitting time at left, center, and right back, and added one goal.

Described as "a pleasant surprise filling in all over the backline",[20] Williams had his contract option picked up to by Columbus, ensuring his return to the club for the 2013 season.

[21] After playing all three defensive positions in 2012, Williams was installed as the primary right back for Columbus to begin the 2013 season, and did not take long to make an impact.

[22] Williams continued to pour in the goals through the first two months of the season, also finding the back of the net in victories over D.C. United on March 23[23] and April 27.

He returned to practice, but was facing a high risk of reclotting, and therefore underwent another surgery on July 16 to remove a rib and alleviate the issue.

He was able to return to action in the playoffs, coming off the bench to replace Eric Gehrig in the second leg of the conference semifinals against New England Revolution.

[30] On December 8, 2014, Williams was traded to MLS expansion club New York City FC in exchange for allocation money.

[31] Williams was named to the starting 11 for the first match in NYCFC history, away to fellow expansion side Orlando City SC on March 8, 2015.

[32] Williams also started the club's first home match at Yankee Stadium, going 79 minutes of a 2–0 victory over New England Revolution before being replaced by Shay Facey.

[33] Williams traveled with the team to face Colorado Rapids, but was sent to the emergency room on March 20 and eventually diagnosed with viral pericarditis.

On July 31, 2015, Williams was picked up off waivers by Toronto FC, the club's second defensive signing of the summer transfer window.

[38] Williams started the final 12 matches of the regular season for the Reds after his arrival, helping Toronto qualify for the playoffs for the first time in club history.

He started in the knockout round against Montreal Impact, pairing with Ahmed Kantari at center back as Toronto was eliminated by a 3–0 scoreline.

[46] Prior to the season, Williams was named as part of the leadership council for the Crew, alongside Federico Higuaín, Ethan Finlay, Justin Meram, and Jonathan Mensah.

Although Williams was named as part of the council, he had to wait to make his season debut, starting on March 18 away to D.C. United and helping keep a clean sheet in a 2–0 victory.

Late in the year, Williams found his scoring touch, pounding in headers in three of the club's last four games of the regular season.

[52] In the MLS Cup Playoffs, Williams started all five of the Crew's matches, including facing both of his former clubs in the conference semifinals and finals.