Michael has lived the USA (Stamford, CT), Canada (Richmond Hill, ON), Tokyo, Japan, and Shanghai, China (Canadian citizen). He started swimming competitively at the age of 5, and earned a black belt in Karate at the age of 7. He also competed nationally in triathlons growing up. Grenon was a four-year MVP in high school, and led his team to an Asia-Pacific Activities Conference (APAC) championship his senior year. He is seeking to major in Biology at Emory University and attend Physical Therapy school.
Michael had a breakout season his freshman year. Adjusting to short course yards would be a challenge to anyone, but not Michael. At UAAs, he had the meet of his life. He dropped in the 50 free(21.17), 100 breast(56.11), and 200 IM(1:52.29). He came in 3rd in the 100 breast and 10th in the 50 free.