Chamberlain joined CBS Broadcast International in 1999 as Vice President, Sales,and was promoted to Senior Vice President, Sales in 2005, shortly after the division merged with Paramount International Television.

Chamberlain began his international television career in 1992 as Sales Coordinator, Samuel Goldwyn Company. His other positions have included Director, International Sales and Marketing, New World Entertainment, and Director, Sales and Planning, Universal Television and Network Group.