The son of a Special Education teacher, Kevin began his career as a high school teacher in inner-city Los Angeles, where he chaired the English Department and led his students to significant academic gains.

Later as an attorney, Kevin defended the U.S. Constitution in California courts and helped prosecute the civil case against China's Huawei Technologies for intellectual property theft. He left private practice to become a prosecutor and Deputy Attorney General, representing the People of California in cases against violent felons. In November of 2020, Kevin and fellow legislator James Gallagher made use of their legal training by winning a trial against Governor Newsom for violating the separation of powers.

In five years in the Legislature, Kevin has authored groundbreaking new laws on freedom of speech, artificial intelligence, privacy, criminal justice reform, and protections for sexual assault victims, along with introducing the most significant school choice legislation in recent years. For his work advancing economic freedom, in 2020 he was named the national Legislator of the Year by the Association of Independent Workers.

Each year in the Legislature, Kevin has declined the per diem allowance, giving up $40,000 in income annually. He also declined a pay raise granted to the Governor and Legislature in 2021, and he has introduced legislation to end special perks like a private DMV office that is available exclusively to state lawmakers and their staff.

Kevin holds a bachelor's degree from Harvard, a law degree from Yale, and a master's in secondary education from Loyola Marymount. He has also served as an adjunct professor at McGeorge School of Law.