Best known for her work in theatre,[1] she has also designed for television, opera, dance, film and exhibitions.
[9] Janson started her career with the Toronto Dance Theatre as a costume designer for its 1972–1973 season.
[2] In the 1980s, Janson started designing for large venues such as Young People's Theatre, National Ballet of Canada, Royal Winnipeg Ballet, St. Lawrence Centre for the Arts, Toronto Free Theatre, Canadian Opera Company, Toronto Arts Productions and Desrosiers Dance Company.
[2] Janson created the design for the Discovery Gallery at Royal Ontario Museum in 1998—one of multiple exhibition projects in her career.
[4] For set designs, projections on unusual surfaces are a trademark of Janson's work.