Aguirre is a lawyer in San Diego, California. He was admitted to the State Bar of California on December 23, 1966. He became an associate at Brobeck, Phleger &amp; Harrison, then one of San Francisco's largest firms. In his spare time, worked on Robert F. Kennedy's presidential campaign. On May 28, 1968, Kennedy sent him a letter that spoke of the special role lawyers played in bringing about orderly change to the nation. Just eight days after sending the letter, Kennedy was assassinated.