[1] After completing ten years of service, Mayer left the army, decided to become an actor, and entered the Guildhall School of Music & Drama in 2002.

[2][6] In Greys Inbetween, a romantic tragedy written, directed, and produced by Andrew Rajan, Mayer plays the villain, the philandering husband who breaks his girlfriend's heart.

[2] In The Ultimate Truth, a comedy written and directed by Nick Clarke with Wysiwyg Films, he plays a confused meglomaniac gangster turned politician with a sweet moll.

[2] After drama school Mayer made brief appearances in BBC One's prime time series Spooks and Hotel Babylon, and more recently in Piers Morgan On... Shanghai as the MC at Chinatown.

[citation needed] In Shanghai he worked with various professional theatre companies, appearing in Yazmena Reza's Art, I Am My Own Wife, No Exit, Oleanna and The Odd Couple.