Greg has worked in the field of children's mental health since graduating from Centennial College's Child and Youth Worker Program in 1991. Professionally, Greg worked for the Children's Aid Society of Toronto in residential and day treatment settings and as a Foster Care Resource Worker. He has been teaching at Centennial College since 2002 in the Part-Time and Apprenticeship Child and Youth Worker programs, part-time and apprenticeship and in the Full-Time Child and Youth Care Program since 2015.