 In 2016 Mulcahy became the Vice-President of Gathering for Gardner, an organisation formed to honour the wide-ranging contributions made by the celebrated mathematician, skeptic, magician, philosopher, and writer.Usually shortened to G4G, it first met in 1993 and since 1996 meets every two years.In 2013 he created the official Martin Gardner site, and in 2013–2014 he chaired the Martin Gardner Centennial Committee.