2008-09: Jonathan Parker was offered a tryout by WHL Seattle after putting up 85 points in 60 games for the Los Angeles Junior Kings U-18 the previous season, Parker skated in 65 games for the Thunderbirds. In his first WHL season he scored 17 goals with 22 assists and was minus-three with 55 penalty minutes. Six of his 17 goals were scored on the Thunderbirds power play. Seattle finished third in the U.S. Division. Parker saw limited ice time in the five-game playoff series with Spokane and had no points nor penalty minutes.
2009-10: Parker began his second WHL season with Seattle and was obtained by Prince Albert in exchange for defenseman Ryan Aasman in a January trade. Parker was one of the top scorers for the Thunderbirds at the time of the trade, scoring 13 goals with 13 assists in 40 games on a team that would finish with the WHL's second-worst record. He struggled offensively following the trade playing more of a checking line role, and finished plus-one with 2 goals and 2 assists with 24 penalty minutes in 29 games for the Raiders. Prince Albert missed the playoffs; finishing fifth in the East Division.
2010-11: Parker had a breakout offensive season for Prince Albert in his third WHL season. He finished fifth in the WHL with 45 goals and had 41 assists to lead the Raiders with 86 points. Parker ended the year with a minus-eight plus/minus and had 45 penalty minutes in 71 games. Prince Albert reached the WHL playoffs; finishing fourth in the East Division despite a sub-.500 record. Parker had 3 assists and was minus-five with 4 penalty minutes in the six-game playoff series with Saskatoon. He was ranked 186th amongst North American skaters in Central Scouting's final rankings prior to the 2011 NHL Draft but was not selected.
2011-12: Parker impressed at the Sabres' prospect camp and after earning an invitation to the team's main camp was signed to a three-year entry-level by Buffalo in October 2011. He split his first pro season between Buffalo affiliates Rochester (AHL) and Gwinnett (ECHL). He scored 3 goals with 3 assists and was minus-four with 6 penalty minutes in 37 games for the Amerks. Parker scored 4 goals with 7 assists in 19 ECHL games with the Gladiators and was minus-five with 10 penalty minutes.
2012-13: Parker spent his second pro season with Buffalo's AHL affiliate in Rochester. He appeared in just 28 games; due in part to family commitments as his father battled terminal cancer. He finished the year with 3 goals and 2 assists and was +1 with 10 penalty minutes. Rochester finished second in the North Division and were swept by first place Toronto in the first round of the playoffs. Parker did not skate in any playoff games.
Parker is a hard-working player, but too small to become an effective checking line player and not skilled enough to be a scorer. Though just 5’10, he has remained quite durable.
Parker spent the year with the Americans but played a small role. He is entering the final year of his entry-level contract and has much to prove if he wants to be re-signed. He currently projects to be a career minor league forward.
Parker was dealt by the Buffalo Sabres along with Brayden McNabb to the Los Angeles Kings in exchange for Hudson Fasching and Nicolas Deslauriers at the 2014 NHL Trade Deadline.