Dr. Schanzlin earned $793,000 in 2008 from UCSD. He may well have had extra consulting income from drug companies, teaching off-campus, expert witness work, and more.
Physician incomes are outrageous compared to those of other professionals with similar education, ability, and working conditions. To be a regular UCSD professor (median income $100,000), you have to be in the top few % of PhDs nationwide. To be a UCSD physician, you have to be in the top 100% of your med school class and residency program.