—Washington Post Company: Chairman and CEO Donald Graham went inside for a successor to longtime CFO Jay Morse. Hal Jones will succeed Morse as SVP-finance and CFO of The Washington Post Company (NYSE: WPO) when the latter retires at the end of the year. Jones most recently has been CEO of Kaplan Professional and previously spent 13 years at PricewaterhouseCoopers. WaPo also promoted Wallace R. Cooney to VP-finance and chief accounting officer.

—Discovery: Brad Singer is resigning as financial chief and treasurer of American Tower to join Discovery Communications (NSDQ: DISCA) as its CFO and senior EVP, effective July 15. He will serve on Discovery’s executive committee and be a “key contributor to the overall strategic direction” of the company. Singer succeeds Roger Millay, who is leaving Discovery.

—Comcast: John Najarian has been promoted to EVP-digital media and business development from SVP-new media and business development for the group’s entertainment sector, where he will oversee mobile, broadband and emerging businesses for E!, The Style Network and G4. Having joined E! in 2001, he spearheaded the launch of E! News Now as well as its mobile initiatives including the E! mobile video channel, site and E! News text alert.

—Channel M: Former TBS exec Dennis Quinn joins as president of sales and marketing of out-of-home/online video marketer Channel M. Quinn’s last job at Turner Broadcasting was EVP, business development. Release.

—PV Media Group: Media consultant James McDonald has taken on the new post of VP, corporate sales and development for online marketer PV Media Group. McDonald has been advising media companies and PE firms on sales and product development and acquisitions. Release.