Jeff Mass was born and raised in Montreal, Quebec. Coming from a family of judges and lawyers it was only a natural fit that his chosen profession was the practice of law.
In 2001 Jeff Mass attended the University of Ottawa and completed his Quebec Civil Law degree in 2004. He completed his Common Law degree in 2005 and was called to both the Barreau du Quebec, and the Ontario Bar in 2007.
After his call to the bar in 2007, Jeff Mass became an associate of a prominent boutique criminal law firm, where he successfully provided defence to hundreds of individuals accused of criminal offences as a trial and appeal lawyer. He is currently a partner in the firm he founded, Mass Tsang LLP.