Marshik received her B.S. degree and Doctor of Pharmacy degree from the University of Minnesota. Following her Pharm. D. degree she completed a 1year clinical research fellowship at Allergy & Asthma Specialists, P.A. and the University of Minnesota. She followed this with a 2 year fellowship in pediatric pulmonary at the University of Florida.
Marshik's research has been in the area of pulmonary disease, with a focus on asthma and COPD. Her current interests include: medication delivery systems, treatment of pulmonary diseases and economic evaluations of pulmonary medications.