2009-10: Jon Gillies skated for the Neponsett River Rats Tier 1 Midget team and played in eight games at Salisbury School in Connecticut after transferring from North Yarmouth Academy. Gillies also attended USA Hockey's National Development Team Program's camp in April.
2010-11: Gillies joined the USHL's Indiana Ice and played 25 games in his first season. Gillies had a record of 15-6-2 as a backup to University of New Hampshire recruit Casey DeSmith and had a 2.82 goals against and .906 save percentage. He appeared in two of five playoff games for the Ice and was 0-1 with a 2.20 goals against and .932 save percentage. Gillies committed to attending Northeastern University in 2012-13. The Quebec Remparts selected Gillies in the ninth round (160th overall) of the 2011 QMJHL Draft.
2011-12: Gillies took over as the starter for the Ice after representing the USA in the 2011 Ivan Hlinka Tournament in the fall. In 53 games for the Ice he was 31-20 with three shutouts and had a 2.77 goals against and .915 save percentage. The Ice reached the Eastern Conference Finals after finishing second behind Green Bay in the regular season and in six playoff games Gillies was 3-3 with a 2.84 goals against and .911 save percentage. Gillies appeared in all four games at the Ivan Hlinka Tournament – starting three of them. He finished 3-1 including a shootout win and had an .892 save percentage. Gillies de-committed from Northeastern in March 2012 after it was announced that Huskies starter Chris Rawlings was returning for his senior season. Gillies was invited to the NHL Draft Combine and ranked sixth amongst North American goalies in Central Scouting's final rankings prior to the 2012 NHL Draft.
2012-13: Gillies took over as the starting goalie for Providence in his freshman season; appearing in 35 games for the Friars. He won a gold medal with the USA team at the 2013 World Junior Championship. Gillies was 17-12-6 with 5 shutouts and had a 2.08 goals against and .931 save percentage. Providence finished in a three-way tie for third in Hockey East and lost to regular season champion Massachusetts-Lowell, 2-1, in the Hockey East semifinals. Gillies appeared in one game as a back up to John Gibson (Anaheim) at the WJC; stopping all 7 shots he faced in 20 minutes of action.
Gillies is a big goaltender who primarily plays a butterfly style. He doesn't sit back in his crease, instead challenging shooters and doing a good job of playing the angles. Gillies could stand to work on his rebound control, and as with any younger, lanky player, he'll need to become more comfortable in his body and improve his footwork. But in time, Gillies could end up as one of the top goaltenders from the 2012 class.
The 2013-14 campaign will be key for Gillies as he returns to Providence College to build upon an impressive rookie season. The American goaltender will also have the opportunity to be the starting goaltender for Team USA as they defend the gold in the upcoming 2014 WJC. He will gain much experience from this upcoming season as he continues to advance in his career path. The progression for Gillies will be interesting to watch after posting an impressive 2.08 goals against average last season in 35 games.