The son of a special education teacher, Kevin grew up in the district, attended local public schools and graduated from Granite Bay High School. After college, he began his career as a 10th-grade English teacher at Manual Arts High School in inner-city Los Angeles, where he chaired the English Department, leading his students to significant academic gains and founding an award-winning speech and debate team. After graduating from law school, Kevin helped prosecute the civil case against China's Huawei Technologies for intellectual property theft and defended the Constitution in California courts. Later, Kevin became a prosecutor and represented the people of California against violent felons as Deputy Attorney General.

Kevin was first elected to the California State Assembly in 2016, where he remained until being elected to Congress in 2022. Since coming to Congress, Rep. Kiley has been a champion for workers' rights. He is leading the effort to overturn the Department of Labor's independent contractor ruling, which limits workers' ability to choose when and where they want to work. Kiley has been a leader in bipartisan reforms as well. He introduced the PRESS Act, which the House passed with bipartisan support, to protect journalists from being compelled to disclose their sources. He led a successful effort to restore Medicare funding for senior programs and is working across the aisle on legislation to protect children from fentanyl.

A tireless advocate for his district, Kiley has supported over 25 projects worth over $70 million in federal grants to reduce traffic congestion, improve public safety, expand access to water resources, and protect our communities from fire. Since Kiley was sworn in, the Third Congressional District has received $200 million in federal grants. Beyond his support for programs and grants to benefit the district, Kiley has made constituent services a priority. Kevin and his team have closed over 2,300 constituent cases, each one representing a family or individual who needed help with a federal agency, and have returned over $7 million to those constituents.

Kevin holds a bachelor's degree from Harvard, a law degree from Yale, and a master's in secondary education from Loyola Marymount. Kevin and his wife, Chelsee, reside in Roseville.