Gavilan

The series, set in Malibu, California, follows the exploits of Robert Gavilan, an ex-CIA agent turned consultant for the DeWitt Institute, an oceanographic research organization.
Gavilan is a former CIA agent who quit the agency in 1976 "when he couldn't tell the good guys from the bad and didn't like what he was becoming." Gavilan then becomes a marine biologist/oceanographer who occasionally gets reinvolved with the CIA.