Holly Hein is from Castaic, California where she grew up playing for several clubs across the Southland as well as in the CalSouth ODP pool (2004-2007). Her youth career was highlighted by winning a USYSA National Championship with the Irvine Strikers (2006). Holly continued her playing career at the University of Michigan where she captained the team in her final two seasons while earning First Team All-Big Ten and NSCAA All-Great Lakes Region Honors (2012-2013). She was also a finalist for the Senior CLASS Award. Holly then went on to play professionally for the Houston Dash and the Seattle Reign of the NWSL (2014) and Åland United of the Finnish Naisten Liiga (2015).