Home Events Happy Birthday Jennifer Hartswick: 10 Collaborations With Umphrey’s McGee Happy Birthday Jennifer Hartswick: 10 Collaborations With Umphrey’s McGee planetsixstring August 19, 2017 comments off Tweet on Twitter Share on Facebook Google+ Pinterest Celebrate trumpeter/vocalist Jennifer Hartswick’s birthday with audio or video featuring 10 collaborations (out of 27 total) with Umphrey’s McGee.