Kirshner was a career oriented person since her early days. By the age of fifteen she started acting professionally.
In the year 1993, she made her film debut from Denys Arcand's Love and Human Remains.
This actress is well known for her performance on the cable TV series The L Word (2004–2009) as Jenny Schecter.
and attended Forest Hill Collegiate Institute but later graduated from the Jarvis Collegiate Institute.
Kirshner studied Russian literature and 20th-century movie industry at Mc Gill University in Montreal.
Mia was born as the daughter of journalist Sheldon Kirshner and a teacher Etti.
Mia was very pretty and talented since her childhood days who dreamed of being an actress since her young days.