To illustrate the complex webs of professional relationships in and around medical marketing, we asked four well-known (and, in some cases, well-traveled) industry execs to discuss the people with whom they’ve crossed paths. And yes, not one, but two Kevin Bacons make a cameo.

Joe Shields

President and cofounder, Health Accelerators

Shwen Gwee

Cofounder and global head of open innovation, Novartis Biome

Andrea Palmer

President, Publicis Health Media

Ritesh Patel

Chief digital officer, health, Ogilvy