[1] Luna was born and raised in East Los Angeles to Mexican immigrant parents and has said that his early experiences with deputies patrolling his neighborhood shaped his view of law enforcement.

[5] In 1985, he joined the Long Beach Police Department and served as a patrol officer and on the SWAT team and was named as the Deputy Chief in 2006.

In November 2014, Luna was appointed as the 26th Chief of the Long Beach Police Department, succeeding Jim McDonnell who had become the Sheriff of Los Angeles County.

[8] Luna was criticized by small business owners, local officials, and other LBPD officers for his handling of the George Floyd protest in Long Beach on May 31, 2020, as part of the nationwide demonstrations against police brutality.

[10] In December 2021, Luna entered the race for the 2022 Los Angeles County Sheriff election, challenging incumbent Alex Villanueva alongside a crowded field of candidates.