He was a New Zealand Broadcasting Corporation (NZBC) advertising executive in 1970 and 1971, and a lay preacher in the Methodist Church.
[4] Mayson represented the Hastings electorate from 1972 to 1975, when he was defeated by National's Bob Fenton.
The third letter stated "We've had enough of your kind of Commie lot [Labour] ... you're selling out on democracy and you will be the first to get a .308 through your stomach."
[6] After losing his seat in Parliament he travelled to Tanzania to visit former parliamentary colleague Phil Amos who was living there.
For his recreation, he enjoys tennis, squash, swimming, reading, and spending time with his family.