It's now official, the Warner Music Group has announced that Atlantic Records Group Chairman/CEO Jason Flom has resigned and that effective immediately Co-Chairman/CEO Craig Kallman has been appointed sole Chairman/CEO.

In addition, WMG also announced that ARG President Julie Greenwald will continue in her role, reporting to Kallman.

In making the announcement, WMG Chairman/CEO of Recorded Music Lyor Cohen said, "We want to thank Jason for all he has done over the past 26 years to strengthen Atlantic's proud tradition as one of the world's greatest homes for recording artists. Thanks to his leadership and exceptional A&R talents, Jason is leaving The Atlantic Records Group well-positioned for continued growth. Jason's indelible impact on Atlantic's culture, his concern for his fellow employees and his contributions to the company's artistic success will be felt for many years to come. He departs with our deepest respect and we wish him only the best." 

"As the consummate professional with a legendary A&R track record of his own," Cohen continued,  "Craig will build on Jason's achievements in discovering and breaking new talent across a wide range of musical genres. Combined with Julie's leadership and energy, a refocused artist roster, an increased investment in A&R, and a strong release schedule, this dynamic management team has recaptured the creative focus and entrepreneurial drive that marked the company Ahmet [Ertegun] founded more than fifty years ago."

During his 26-year relationship with Atlantic, Flom is credited with an A&R track record that included multi-platinum-selling albums from artists such as Sugar Ray, Kid Rock, Tori Amos, Simple Plan, Skid Row, Twisted Sister, Matchbox Twenty and The Corrs. He formed his Lava Records label in 1995.

Kallman became Atlantic Co-President in 2002 after the company bought his Big Beat label in 1991.