Alton has been the paper's editor for almost 10 years, during which monthly Sport, Music, Woman and Food magazines were introduced, as was the paper's move to the Berliner format in 2006. Earlier this year, The Observer won Newspaper of the Year at the British Press Awards.

“It has been an immense privilege to edit The Observer and work with such a brilliant team. For the best part of ten years, this has been the time of my life,” Alton said, according to Press Gazette. “The Observer is in fantastic shape, editorially and commercially, and this is the right time for me now to be handing over to John.”

Alton said Mulholland has a “clear vision and ambition for (the paper's) print and digital future,” and called him “a fabulous journalist and a dear friend I would trust with my life.”

Mulholland, 44, played an important role in the newspaper's move to the Berliner format, and developed and launched most of the newspaper's monthly magazines, Liz Forgan, chairwoman of The Scott Trust, which owns The Observer, told Press Gazette. He has been deputy editor since 1998.