Apollo's creed could be that we all deserve the chance to advance. The for-profit Apollo Group provides educational programs through a number of subsidiaries, including online stalwart University of Phoenix. The largest private university in the US, the University of Phoenix accounts for more than 90% of Apollo's sales and has an enrollment of 400,000 students in degree programs ranging from associate's to doctoral. Other schools include Western International University (graduate and undergraduate courses) and UK-based BPP Holdings, a provider of legal and financial professional training. Founder and chairman John Sperling and his son, vice chairman Peter Sperling, together own a controlling stake in Apollo.