Williams raced go-karts, quarter midgets and Allison Legacy cars to help advance his early racing career.
ARCA Racing Series
Williams drove five races in the 2010 ARCA Racing Series in his family car, numbered 02. He recorded the best finish of 15th at Iowa Speedway. Williams caught the attention of those in the racing community with those performances, as he ran three races for Andy Belmont the following year and another three for his family team, which later developed an alliance with Lira Motorsports. Williams recorded two top-tens in Belmont's car and one more in his own car. For 2012, Williams took his Josh Williams Motorsports team full-time, running all but one race while having limited funding. He failed to finish three races and had four top tens with a best finish of seventh. The 2013 season was a struggle, to begin with for Williams, who remained sponsorless through the first five races of the season despite having two top ten finishes. He then signed a four race deal with Roulo Brothers Racing, making sporadic appearances in their Ford racecars. Running in between races for Roulo with his family team, Williams was signed by Frank Kimmel to drive one of his cars at Road America, starting and parking. Williams drove the next race for GMS Racing, again start and parking at Michigan International Speedway. Williams carried the sponsorship from Allegiant Air for the rest of the year, grabbing his first top-five finish. He finished fifth in points while utilizing four teams to get there. Again hampered by limited funding, Williams scaled back to just over half the schedule in 2014, always running near or in the top ten. He scored another runner-up finish in the season's penultimate race. He raced the full season with the number six in 2015, except for one race with Cunningham Motorsports. He only finished outside of the top ten in five races and finished third in the drivers standings, behind Grant Enfinger and Austin Wayne Self, who passed Williams for second during the final race. 2016 brought new success for Williams, as he won his first two races, at Madison International Speedway and Nashville Fairgrounds Speedway. He finished fifth in points after an inconsistent season with 11 top tens. Williams had said that he would have liked to run more ARCA Racing Series races in 2017. His team ran two races in the beginning of the season in a partnership with Lira Motorsports, and Williams himself went behind the wheel for the annual Salem Speedway throwback weekend, running fourth. Williams returned once again in 2018 season behind the wheel of No. 6 Chevrolet at Talladega in a partnership between his own team and Our Motorsports. They finished 5th.
National series
Williams and family made one Camping World Truck Series start in a partnership with T3R2 Racing, falling out at Martinsville Speedway in 2014. He made two Xfinity Series starts as a start and park driver, one for Jimmy Means Racing and one for King Autosport. He was announced as the driver of King's No. 90 entry for the spring Bristol Motor Speedway Xfinity race on April 21, 2017. Longtime friend Mario Gosselin helped Williams get the ride. Along with the Bristol race, Williams wanted to run about six Truck races for his family team in 2017. The Truck races never came, but Williams garnered six other starts split between King's 90 and 92 cars, mostly starting and parking in the 92 and running full races in the 90. At Daytona in summer, Williams was running just outside the top ten before he was clipped by Daniel Suárez, finishing last. Williams broke the top thirty in all of his full races. For 2018, Williams took over the majority of the races in the No. 90 and served as crew chief for drivers of the 90 like Donald Theetge and Andy Lally most weekends when he was not in the seat. On January 29, 2019, it was announced that Williams would move over to DGM's No. 36 car for the 2019 NASCAR Xfinity Series season. After gambling on pit strategy, Williams finished a career-best sixteenth in the Boyd Gaming 300 in early March. He later improved on that career-best with his first career top-ten, an eighth at Talladega Superspeedway in the spring. The finish helped Williams and DGM bounce back from a sponsor who failed to pay the team in the beginning portions of the year.
Personal life
Williams visits children's hospitals to give back to the community in his free time. Williams, with his wife, owns a company that prepares foreclosed homes for auction, which he works at during the week while racing.
