Keenan has worked in media for more than 20 years, 17 of them at Bauer, or Emap prior to its acquisition by Bauer in 2008.
He has also been a board director of the PPA for a number of years.
Keenan said: "I look forward to getting under the skin of the outstanding work from our industry's most innovative, creative and effective communicators."
The final deadline for entries has just passed and table bookings for the awards evening on 29 October now begin in earnest.
The early bird discount for table bookings for the big night at the Grosvenor House Hotel runs until 17 July. Full details can be obtained from www.mediaweekawards.co.uk.
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