Pearson, a US national, joined Novartis in 2003 from PR agency GCI, where he was Americas president. He joined the agency in 1998 to build its healthcare practice.
Dell has a long-standing relationship with GCI across various territories. The agency was brought in to advise Dell in the US in 2001.
Pearson is in the process of relocating to Dell's headquarters in Austin, Texas, where he will report to V-P of investor relations and corporate comms Lynn Tyson.
Novartis has moved quickly to replace Pearson with Carol-Anne Whittaker. The British national has transferred internally from a global marketing role.
She joined Novartis six years ago from Procter & Gamble, where she worked in marketing.