Rick Krohn, MA, MAS An expert in healthcare corporate strategy and strategic marketing, business development, corporate communications, technology development and commercialization, Mr. Krohn has served as President of HealthSense since 1998. David Metcalf, PhD has a more than 20 years experience in design and research of web-based and mobile technologies converging to enable learning and healthcare. Recent efforts include the development of mobile technology strategies for Tufts University and University of Central Florida medical schools.