Marshall is an experienced financial advisor and well-known speaker who specializes in financial strategies for medical and dental professionals. He is a published author, having co-authored editions of Real Life Financial Planning for the New Physician & Real Life Financial Planning for the Young Dental Professional. In addition, Marshall is a founder of Gifford Financial and a Senior Partner at North Star Resource Group, where he helped create the North Star Medical Division. He is a frequently requested speaker at national medical and dental conferences, and his perspective and wisdom have resulted in guest spots as a financial expert on KARE11, WCCO, and Fox News.

^{Marshall is a registered representative and investment advisor representative of CRI Securities, and Securian Financial Services, Inc.}