2005-06: A.J. Jenks skated for the Detroit Honeybaked U-18 and Midget major teams. Jenks made a verbal commitment to the US NTDP and the University of Michigan but then decided to play major junior hockey instead. He was selected by the Plymouth Whalers in the seventh round (132nd overall) of the OHL Priority draft.
2006-07: Jenks was the leading rookie scorer for Plymouth with 9 goals and 14 assists and was +4 with 50 PIM in 68 games. Jenks had 1 assist with 8 PIM in 20 playoff games as the Whalers captured the OHL championship and had 1 assist with 2 PIM in Plymouth's five Memorial Cup games.
2007-08: Jenks was Plymouth's third-leading scorer in his second season with the Whalers. He scored 26 goals with 29 assists and was -13 with 94 PIM in 68 games. Jenks was especially lethal on the power play, scoring 15 times. Jenks was -9 in four games with 1 power play goal as the Whalers were swept by Kitchener in the first round of the OHL playoffs. Jenks played for Team USA at the 2007 Ivan Hlinka Memorial Tournament and was invited to the USA tryout camp for the WJC in Lake Placid. Jenks was chosen in the 4th round (100th overall) of the 2008 NHL Draft by the Florida Panthers.
2008-09: Jenks returned to Plymouth for his third season after attending rookie camp with the Panthers. He scored 21 goals, nine on the power play, with 31 assists and was -7 with 78 PIM in 61 games for the Whalers. Both he and the Whalers got off to a slow start (the team was 6-11-2 when coach Greg Stefan resigned in November), but he picked up his offense later in the year and Plymouth rallied to reach the OHL playoffs. In the playoffs Plymouth defeated Sarnia in the first round but fell to eventual Memorial Cup champion Windsor in the second round. Jenks scored 1 goal with 2 assists and was -1. Most notably, he was kept scoreless on the power play.
2009-10: Jenks had an outstanding year – both with Plymouth and at the World Junior tournament – where he was part of the gold medal-winning USA squad that ended Canada's run of five straight titles. In 52 OHL games, Jenks scored 23 goals with 40 assists and was +12 with 58 PIM. Once again dangerous on the power play (8 goals), Jenks also scored 4 short-handed goals. Playing for Team USA, he scored 3 goals with 2 assists and was +6 with 6 PIM. Jenks continued his hot scoring in the OHL playoffs, as the Whalers swept the Soo Greyhounds but then were defeated by Memorial Cup-bound Windsor in a five game series. In nine playoff games, Jenks scored 4 goals with 8 assists and was +4 with 14 PIM. Jenks signed an entry level contract with Florida in April.
2010-11: Jenks had a solid, if unspectacular first season in pro hockey with the Rochester Americans (AHL). After missing time at the beginning while recovering from a procedure to correct an irregular heartbeat, Jenks was a fixture in the Rochester lineup and played in all situations. In 63 games for the last-place Amerks, he had 8 goals with 13 assists and was +3 with 48 PMs.
2011-12: Jenks had a difficult second pro season — splitting the year between the AHL and ECHL. He began the year with Florida AHL affiliate San Antonio but was demoted to ECHL Cincinnati after eight games. He shuffled between the two teams before being traded to Carolina as part of a four-player deal in January and finished the year with the Hurricanes' AHL affiliate Charlotte. After failing to register a point in 25 games with the Rampage he scored 4 goals with 5 assists and was minus-two with 13 penalty minutes for Charlotte. He scored 3 goals with 3 assists and was plus-three in 13 ECHL games with Cincinnati.
Jenks is a power-forward style of player, with surprising speed and agility for his size. He has a scorer’s mentality, and a good shot. Jenks' long reach and quickness helps make him a solid defensive player and good penalty killer. He is also good on face-offs and thrives in power play situations. Jenks has become a more consistent player during his rookie season in the AHL, but could stand to shoot more in order to avoid dry spells during the season.