Our Leadership Team

Founder
Jack Esselen
With over 25 years of executive experience across the information technology, insurance, banking, and healthcare industries, Jack has grown Sentry MD into a world-class customer support organization. Under his leadership, Sentry MD has become the leading technology platform for managing requirements for healthcare organizations and universities. In recognition of his leadership, Jack was named one of the 10 Most Empowering Leaders of 2023 by Industry Era Magazine.

Chief Executive Officer
Tim Sarantis
For nine years, Tim has served as the chief architect of the Sentry MD system, working closely with each customer to create a tailored product that meets their unique needs. With expertise in Software as a Service (SaaS), mobile, and cloud computing development, Tim builds innovative solutions for IoT, Big Data, and AI-driven analytics, delivering systems that stand out from competitors.

Chief Engagement and Revenue Officer
Taryn Schnitz
Taryn is a results-oriented sales and client sucess leader with a strong focus on customer service and driving growth at Sentry MD. She oversees all marketing and sales efforts while building and nurturing relationships to enhance customer loyalty and retention.

Chief Operations Officer
Nichole Mischke
​Nicole is a seasoned client success strategist with 18 years of experience at Sentry MD. She leverages her expertise in state and federal compliance and regulatory processes in healthcare to educate and support clients, ensuring their experience with Sentry MD exceeds expectations.

VP & Client Success Practice Leader
Summer Rangel
Summer has been with Sentry MD for four years and has developed a deep understanding of Sentry MD’s value proposition. She delivers ongoing, top-tier support to our clients, ensuring they receive personalized attention, timely solutions, and effective strategies to maximize their success