As the son of ten-time Canadian Olympian, Ian Millar, Jonathon began riding at age eight on the family farm in Perth, Ontario, alongside his younger sister, Amy. However, it wasn’t until the early 1990s that he developed a serious interest in competing.
Following a successful Young Riders’ career where he helped Canada earn team gold and silver medals respectively at the 1992 and 1993 North American Young Riders’ Championships, Jonathon entered the grand prix ranks the following year and, in the Selection Trials for the 1994 World Equestrian Games, earned a fifth place finish. That same year, Jonathon made his Nations’ Cup debut riding for Canada at the Washington International Horse Show and was named to the 1994 Canadian Jumping Team Short List for the first time.
Following the 1996 season, Jonathon moved to the Netherlands to train with renowned Dutch Olympian, Emile Hendrix. Following three full seasons competing in Europe, he returned to Canada in time to contest the 2000 Sydney Olympic Selection Trials and was named a Canadian Olympic Team alternate. That fall, Jonathon had the unique distinction of riding alongside his father in three prestigious Nations’ Cup events in Calgary, Washington and Toronto.
Jonathon has most recently represented Canada in Nations’ Cup competition with his top mount, Calvin Klein. His grand prix string also includes Bonzay and Daveau, and he’s also developing the exciting young prospect, Dublin.
In December of 2015, Jonathon married his long-time girlfriend, Kelly Soleau, who is also a competitive grand prix rider. Based at Millar Brooke Farm in Perth, Ontario, the couple competes in Europe and throughout North America, including Wellington, Florida, where they spend the winter months.