Greig was co-founder of The Combination, one of the first fringe groups to emphasise group work, improvisation and flexible working spaces. He was also a director at Almost Free, the venue for the first gay season of plays put on by Ed Berman. He was a writer and director with the Bradford community based company The General Will.

Noël has worked in theatre since 1966, as an actor, writer, director and teaches on a regular basis at schools, universities and colleges as well as giving special courses often linking creative writing with drama. He is already popular in Luxembourg and the NWTC as one of the regular tutors at the Munsbach Summer Theatre School.

He was one of the co-founders of The Brighton Combination, which in 1968 was the first alternative theatre to have its own building . He is the co-founder of England's first gay theatre company, Gay Sweatshop. He was a writer-in-residence with the theatre-in-education group, Theatre Centre.

Noël wrote, acted and directed for the Gay Sweatshop and was resident writers tutor at the Royal Court YPT. His work abroad has mostly been in African and Asian countries where he used his talents to create work linking groups of young people from different countries and from different cultural and ethnic backgrounds.

Recently he has been employed as a consultant for a schools writing project in conjunction with the Royal National Theatre Education Dept and Queen Mary College, has been a tutor with the Hope Street Community Project, Liverpool, has directed Winter Sun by Pervaiz Khan at the Leicester Haymarket Theatre and has had one of his own plays Always the Bridesmaid broadcast on BBC4.