Bell was employed as vice president and general counsel of United Savings from 1977 to 1981. He left to found Gregory Bell and Associates law firm, which merged with
Kirton & McConkie in 1984, where he was a shareholder, director, and officer until leaving in 1997. He became a partner in Raddon/Bell Properties, a real estate development company. Envision Utah is a public/private partnership that "work[s] toward quality growth within the Greater Wasatch Area of Utah" and to develop a "vision to protect Utah's environment, economic strength, and quality of life for generations to come". Bell also served on the board of trustees of the Coalition for Utah's Future. He served as president of the Farmington Bay District of the
Boy Scouts of America and as chair of the Real Property Section of the
Utah State Bar. Bell served as a member and chair of the governing authority of the Utah Science, Technology and Research initiative (USTAR) from 2014 until 2016. Governor Gary R. Herbert appointed Bell to the board of trustees of the
Utah Transit Authority in 2016, and Bell was elected chair of the board effective January 2018. He was elected to senate leadership as assistant majority whip by his colleagues for 2008–2009, serving on the Joint Leadership, Executive Appropriations, and Legislative Management Committees. On September 16, 2013, Bell announced he would resign his position as Utah's lieutenant governor, citing his "family's long-term financial needs". Bell indicated that his resignation would take effect after Utah Governor Gary Herbert nominated, and the Utah State Senate confirmed, his replacement. Herbert nominated
Spencer Cox to replace Bell on October 8, and Cox was subsequently confirmed and took office. ==Electoral results==