As of my last knowledge update in April 2023, there is no widely recognized author by the name of M. K. Ahearn. Without more specific details, it is challenging to provide a short description. It is possible that M. K. Ahearn may be an emerging author, a pseudonym, or an author who has not yet gained widespread recognition. If this is a pen name or an author with a very limited or niche readership, information about them could be scarce or localized to particular communities, literary circles, or genres. If you can provide more context or details about the works they have written, I could attempt to give a more accurate description. Otherwise, I would recommend checking the latest sources or databases that specialize in author profiles and bibliographies for the most current information.