Eric Goldman of Santa Clara and Rebecca Tushnet of Georgetown have written Featuring People in Ads (2014 Edition) from Advertising & Marketing Law: Cases and Materials (2014 edition). Here's the abstract:
This is a book chapter from the 2014 edition of a casebook, Advertising & Marketing Law: Cases and Materials, by Rebecca Tushnet and Eric Goldman. This chapter examines the legal issues arising from featuring people in advertisements, including publicity rights and endorsement/testimonial guidelines.