Simon Gervais was born in Montréal, Québec. He joined the Canadian military as an infantry officer and was commissioned as a second lieutenant in 1997. In 2001, he was recruited by the Royal Canadian Mounted Police and became a federal agent. His first posting was in Toronto, where he served as a drug investigator. During this time, he worked on many international drug-related cases in close collaboration with his American colleagues from the DEA. His career switched gears in 2004, and he was placed with a federal antiterrorism unit based in the Ottawa region. During the following years, he was deployed in several European and Middle Eastern countries. In 2009, he became a close-protection specialist tasked with guarding foreign heads of state visiting Canada.

He served on the protection details of Queen Elizabeth II, US president Barack Obama, and Chinese president Hu Jintao, among others. Gervais lives in Ottawa with his wife and two children.