Omnicom filed an 8-K announcing the appointment of Tom Schwenger as Chief Executive Officer of Omnicom Health's marketing business, effective immediately, as disclosed on November 2, 2026.

Key Highlights

  • New appointment: Tom Schwenger has been named Chief Executive Officer of Omnicom Health's marketing business, effective immediately.
  • Predecessor departing: Dana Maiman, who previously oversaw the unit, is leaving the company.
  • Prior role: Schwenger joins from Veeva Systems, where he served as President and Chief Customer Officer.
  • Experience cited: The filing states Schwenger brings more than 35 years of experience in pharma, biotech, and healthcare verticals.
  • Veeva tenure: According to the filing, Schwenger tripled revenue during his time at Veeva Systems.
  • Continuing leadership: Michael Larson remains Chairman of Omnicom Health and will directly oversee the group's specialty health business.

Schwenger's Appointment and Maiman's Departure at Omnicom Health

According to the filing, Omnicom (NYSE:OMC) announced that Tom Schwenger has assumed the role of Chief Executive Officer of Omnicom Health's marketing business. In this capacity, the filing states, Schwenger will oversee Omnicom Health's global marketing agencies and, together with the group's Agency Leaders and Integrated Client Leads, will develop and implement client engagement models for pharma, biotech, and consumer healthcare clients. The filing notes he will work closely with Michael Larson on the leadership transition.

The filing states that Schwenger previously served as President and Chief Customer Officer at Veeva Systems, where he "drove significant growth and innovation across both products and services, tripling the revenue during his time at the organization." Before Veeva, the filing reports, Schwenger "spent nearly three decades at Accenture and rose to lead its life sciences practice." The filing attributes to Larson the characterization that Schwenger has "a proven ability to drive transformative growth through technology and AI."

Regarding Maiman's departure, the filing quotes Larson as saying, "I want to thank Dana for her leadership of Omnicom Health, and before that, IPG Health." Maiman is quoted in the filing as stating she is "leaving with confidence in the strong leadership team and its ability to build on our momentum." Larson is described as retaining the Chairman role and also taking direct oversight of Omnicom Health's specialty health business following the transition.

What Was Disclosed

Omnicom disclosed the appointment of Tom Schwenger as CEO of Omnicom Health's marketing business and the departure of Dana Maiman, who previously led the unit. Michael Larson remains Chairman and takes on direct oversight of the specialty health business.