A former collegiate swimmer and water polo player for Air Force, Jahn spent two years as an assistant coach at UNLV and Idaho prior to arriving at Tennessee. She was previously a graduate assistant with the Lady Vols for two seasons from 2008-10.
In Jahn's first season on Rocky Top in 2013, Tennessee enjoyed strong dual meet and championship seasons as a combined program. The Lady Vols won their first three NCAA relay titles on their way to finishing third as a team at the national meet, the best finish in program history. Meanwhile, the Vols took fourth at SECs and 16th at NCAAs.
In 2014, Tennessee's women again produced a top-10 finish, taking seventh overall at the NCAA championships. Lindsay Gendron highlighted the meet by winning the bronze medal in both the 200 freestyle and 200 butterfly, setting school records in both. The UT men again improved from the year before, finishing 15th.
At the SEC meet in 2015, the men's and women's teams improved placement from the year before, both finishing fourth in the standings. On the men's side, Sean Lehane defended his SEC title in the 200 backstroke and placed second in the event at NCAAs. The year marked a real youth movement for the men's teams with six swimmers or divers earned All-America honors for the first time. Molly Hannis led the Tennessee women throughout her final collegiate season. At the SEC meet, she earned two more silver medals in the breaststroke events and also helped Tennessee win the two medley relays. She ended her career as a 14-time All-America by picking up four more awards.
When Jahn was a graduate assistant with the women's program at Tennessee, the Lady Vols had 23 NCAA qualifiers, 15 All-Americans and seven SEC individual champions.
Prior to her coaching career, Jahn spent four years as a member of Air Force's water polo squad and three seasons on the swimming team, graduating in 2003 with a degree in social sciences. She then spent five years with the US Air Force as a Medical Service Corps Officer before starting graduate school at Tennessee.