Jennie Brannigan is a successful alumna of the Young Riders program, having won team and individual gold at the 2008 NAYC for eventing with her KWPN gelding, Cooper. She had her first completion at the top level of the sport in 2015 at the Kentucky Three-Day Event with Cambalda. In 2021, she finished in fourth place overall at the Maryland 5 Star CCI5* with Stella Artois.

Brannigan has represented the U.S. Eventing Team at Boekelo, The Netherlands, competing in the CCIO3* in 2012 with Cambalda, the CCIO4-L with Stella Artois in 2019, and the CCIO4-L in 2021 with FE Lifestyle. Recent top results for Brannigan include a third-place finish in the CCI4-L at The Event at Rebecca Farm in 2021, a second place at the CCI4-S at Stable View in 2022, and a win in the CCI4*-L at Bromont in June of 2022, all with her own Thoroughbred gelding, Twilightslastgleam.