Johnnie Garza has served Cal South in a variety of positions, first as a coach for the Olympic Development Program in 1998 and 1999, then as the Assistant District Commissioner for District 6 from 1999-2002. He served as State Cup Chairperson from 2005 until 2007. He also served on the Cal South Board of Directors as the Assistant Vice-President for three years after being elected to his first term in 2007.

Johnnie has been involved in the Southern California youth soccer scene for over 23 years. He began his involvement as a recreational coach for the Palmdale Youth Soccer League (PYSL) in 1988. He also contributed to the PYSL program as a referee, and in 1991 became the league's registrar where he served for three years. He moved to the competitive arena in 1995, when he founded the Antelope Valley Soccer Association. He served as the club's first president until 2005.

Professionally, Johnnie is employed by the U.S. Department of Transportation's Federal Aviation Administration, where he has worked for 30 years. He began his career as an air traffic control specialist at Los Angeles Air Route Traffic Control Center. He has also worked as an Operations Supervisor at the Edwards Air Force Base Flight Test Center Radar Approach Control facility. He has extensive experience as a second and third level manager. He served as the FAA's Director for Tactical Operations for the Western United States from 2008 to 2010, where he managed day-to-day tactical air traffic operations within the National Airspace System. He was also responsible for customer integration with the FAA and other federal agencies on matters related to airspace capacity and efficiency for all major markets in the Western U.S. He is currently the Air Traffic Manager at Los Angeles Center, which manages nearly 2.5 million air traffic operations a year in the Pacific-Southwest.

Johnnie and his wife Cindy have been married for 32 years. They have raised three children, Stephen, Matthew, and Amy, all of whom grew up playing youth soccer in Cal South programs. They have recently welcomed their first two grandsons', Cash and Johnnie III as the newest additions to their family. Together, they have served Cal South at nearly every level of involvement within the association.