Leach specializes in complex commercial and civil litigation, construction law, and real estate.

[1] In 2020, Leach was angered by tweets from a professor at Collin College, within his district, critical of then-Vice President Mike Pence.

In January 2022, the college offered the professor a large settlement for violating her First Amendment rights.

[3] Leach and his wife Becky have three children and are members of Cottonwood Creek Church in Allen.

[4] Leach's seat was targeted by the Texas Democratic Party in 2020;[5] however, Leach defeated his opponent, Lorenzo Sanchez, by a margin of 51.7% to 48.3%, despite Democrat Joe Biden winning the 67th district in the concurrent presidential election.