Tom Tholen was promoted to president of Callahan Creek. He has been with the agency since 2005 and will keep his most recent position as chief strategy officer.
The New York Times Company named Cella M. Irvine chief executive officer of the About Group. She was previously chief administrative officer at Digitas.
John Najarian was promoted to exec VP-digital media and business development at Comcast Entertainment Group. He joined Comcast in 2001 and most recently served as senior VP-new media and business development.
Titan Worldwide tapped Vista Media Group VP Brad Staten as VP-general manager of its San Francisco office.
Dennis Quinn joined Channel M as president-sales and marketing. Most recently, he was exec VP-business development for TBS.