On the best-seller list because … its QuestRx education platform has tantalized clients with its combination of gamification strategies and peer-to-peer learning principles. The platform’s evolution helped Fusion lure a handful of A-list companies including Bristol Myers Squibb, Janssen Oncology and Alexion Pharmaceuticals to its roster. To accommodate the new business, the Mahwah, New Jersey-based agency doubled its head count, from 15 at the start of 2021 to 30 at the end of it.