24 employees have rated Tabula Rasa HealthCare Chief Executive Officer Calvin H. Knowlton, BScPharm, MDiv, PhD on Glassdoor.com. Calvin H. Knowlton, BScPharm, MDiv, PhD has an approval rating of 91% among the company's employees. This puts Calvin H. Knowlton, BScPharm, MDiv, PhD in the top 30% of approval ratings compared to other CEOs of publicly-traded companies.