[3] He was considered a promising junior rider,[1] and trained under Roger Deslauriers, George Morris, Jay Hayes and Hugh Graham.

[1] Lamaze was named to the Canadian team for the 1996 Summer Olympics in Atlanta, Georgia, but lost his place and received a four-year suspension after testing positive for cocaine.

[5] Lamaze rebuilt his career and ascended the rankings, being again regarded as a key member of the Canadian team for the Sydney Games.

He was also the first North American jumping rider to exceed one million in prize money a year, a third of these earnings the result of winning the CN International Grand Prix at Spruce Meadows.

[6] In the January 2009 Rolex World Rankings for show jumping by the International Equestrian Federation, Lamaze was named to the top spot for the first time.

In July that year, he had two major wins with Hickstead, at the Aachen World Equestrian Festival[11] and the Spruce Meadows Queen Elizabeth II Cup.

[14] After the death of Hickstead in 2011,[15] Lamaze selected the nine-year-old mare Derly Chin De Muze to ride at the 2012 London Olympics.

[23] Lamaze's battle with brain cancer continued, and on March 31, 2022 he announced that he would be retiring from competition in order to focus on his health.

The situation with my health has forced me to make the decision earlier than I had envisioned, but the silver lining is that I still have the will to win and can contribute to the Canadian team and the sport I love through my new role.

As the case slowly made its way through the court system, evidence emerged suggesting Lamaze had forged his medical history.

In order to dismiss this allegation that his cancer and health issues are entirely faked, Lamaze would need to produce reliable medical evidence to prove his claims.

[31] Lamaze was found liable for $1.4 million in damages for fraud, breach of contract, and breaking Florida law, related to the purchase and sale of two horses.