[3] Williams coached Marquette to a 25–10 record in the 2008–09 season, where they lost to the Missouri Tigers in the second round of the 2009 NCAA tournament.
He coached Marquette to a 22–12 record in the 2009–10 season, which ended with a close loss to the 11th-seeded Washington Huskies in the first round of the 2010 NCAA tournament.
3 seed in the NCAA Tournament, they defeated BYU and Murray State to advance to their second straight Sweet Sixteen.
After winning a share of the Big East Men's regular season championship, Marquette received an at-large bid in the 2013 NCAA tournament as a No.
The 2013–14 season was Williams' worst at Marquette, finishing 17–15 with a loss to Xavier in the Big East tournament.
Williams was named the head basketball coach at Virginia Tech on March 21, 2014, replacing James Johnson.
The move had critics questioning why he would leave Marquette for Virginia Tech, "one of the country’s toughest rebuilding projects.
Expectations grew further when Williams landed commitments from Maryland transfer Seth Allen, and Zach LeDay from South Florida.
The team had continued success in the ACC, ending the regular season with another upset of a top-10 rival, this time 7th ranked Miami.
Williams' Hokies finished the regular season at 10–8 in ACC conference play; an improvement of eight wins from the previous year.
The Buzz’s Bunch Scholarship Endowment will be awarded annually to an undergraduate student at Virginia Tech in any field of study who is registered at the school with a disability.
Before the season started, freshman Landers Nolley (Top 100 recruit, 2017-2018 Georgia Player of the Year[8]) was deemed ineligible due to his ACT score being suspiciously high, casting doubt on its validity despite his high school coach describing Nolley as an "Ivy League-type guy".
Despite these major setbacks, Williams led the Hokies to a 23–7 regular season with 12 wins in the ACC, the most in program history.
In their Sweet 16 matchup the Hokies faced ACC rival Duke, a team they defeated earlier in the season.
The next year, the team was marred by illness from the ongoing pandemic and canceled a majority of their games before drudging to an 8–10 (2–8 SEC) record.
The team was expected by many to make it into the NCAA Tournament, but an 8 game losing streak in the regular season was the deciding factor against their entry.
The team earned a spot as a 1 seed in the NIT, making it all the way to the championship game in Madison Square Garden before falling to Xavier.
The team defeated Nebraska in the first round before falling to #2 ranked Houston in overtime, concluding their season with a 21-15 record.