LA Times: The gig: Chief executive of Sapphire Energy Inc., a San Diego biofuels company that develops algae-based fuel that has been used experimentally to power airplanes and, recently, a car that was driven across the country. The serial entrepreneur has had a hand in starting several companies in industries including medical engineering and biotechnology. Sapphire hopes to produce 1 million gallons of algae diesel and jet fuel each year in the next two years, and up to a massive 1 billion …