Wall, currently number two to Sir Clive Hollick, has worked at United since 1992 when he joined as chief executive of Meridian Broadcasting, the ITV franchise in the south of England that United sold to ITV company Granada.
He later became chief executive of United Broadcasting and Entertainment, and was appointed chief operating officer in November 2000. He was appointed to the board on January 1 2002. Wall is also a non-executive director of TV Travel Shop and Five.
News of Wall's entry into the race for the top Emap post comes on the heels of weekend reports that link John Makinson, the head of Pearson's book publishing arm Penguin and natural successor to Pearson CEO Marjorie Scardino, to the position.
The high-profile vacancy came up for grabs when Miller, a former Emap chairman, announced he was retiring from the role of chief executive this summer.
Miller stepped back into the chief executive's role last summer following the resignation of Kevin Hand. He originally stepped down from the chief executive's role when he took the title of chairman in 1998.
Hand was forced to quit Emap after his ill-fated attempt to launch Emap USA cost the company over £400m. Emap sold the division for less than half the £720m it paid for it two years earlier.
Hand is now heading up Emap rival Hachette, which has control of Elle and Red in the UK, as well as the former Attic Futura magazines Sugar and TV Hits it acquired in a £40m deal earlier this year.
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