Glenn Yeffeth was, along with Jane Espenson, the editor of Finding Serenity. He is a publisher of BenBella Books. For 15 years, Glenn was a corporate strategist and marketer who ran companies in Chicago, London, and Dallas. In 2001, Glenn formed BenBella Books (named after Glenn’s children Benjamin and Isabella) to combine his love for books with his passion for marketing. Glenn has an MBA in Marketing and Finance from the University of Chicago and a BA in History from Oberlin College. 
He appears to have no other direct connection with film and television, since he lacks an IMDb entry.