Under the
Johnny Saint ring name, Miller debuted as a professional wrestler in June 1958, being defeated by Colin McDonald. He also had two European Lightweight Championship reigns in 1979 and 1983. On 10 October 1996, Saint defeated Naohiro Hoshikawa at a
Michinoku Pro Wrestling event in what was billed as Saint's retirement match. The following day, Saint teamed with Quackenbush to defeat the team of Kidd and
Colt Cabana, with Saint pinning Kidd. On 7 June 2018, it was announced that he would be the general manager of the
UK division of its
NXT brand. He would remain as general manager until the brand's closure in September 2022. On August 24, 2025, Saint made an appearance for
All Elite Wrestling (AEW) as part of their
Forbidden Door event at
the O2 Arena in London, England. He was part of pre-recorded segment alongside British wrestler and commentator
Nigel McGuinness who was challenging fellow British wrestler
Zack Sabre Jr for the
IWGP World Heavyweight Championship as part of AEW's working relationship with
New Japan Pro Wrestling. During the match, Saint also appeared at ringside with former World Mid-Heavyweight and
British Light Heavyweight Champion Marty Jones. ==Professional wrestling style and persona==