Stephen P. MacMillan
Chairman, President and Chief Executive Officer
Hologic, Inc.
Leadership History
4 leaders · Full leadership timeline
Stephen P. MacMillan is the CEO of Hologic.
| Name | Role | From | To | Years in role |
|---|---|---|---|---|
| Stephen P. MacMillan | Chairman, President and Chief Executive Officer | — | Present | — |
| Erik Anderson | President, Breast and Skeletal Health | — | Present | — |
| Jennifer Bennington | President, Diagnostics Solutions | — | Present | — |
| Essex Mitchell | President, GYN Surgical and Medical Aesthetics | — | Present | — |
Founded in 1985 in Marlborough, Massachusetts by S. David Ellenbogen and Jay A. Stein, Hologic began with a pioneering focus on bone densitometry. Over the subsequent four decades, the company transformed into a global healthcare powerhouse through strategic technological innovation and landmark acquisitions—most notably acquiring Cytyc in 2007 for $6.2 billion (securing the ThinPrep Pap test and NovaSure) and Gen-Probe in 2012 for $3.7 billion (securing the Panther and Aptima molecular diagnostics franchise). Today, Hologic touches the lives of hundreds of millions of women worldwide. As the global vanguard in women health, Hologic serves healthcare providers across more than 100 countries, delivering cutting-edge technologies that detect breast cancer earlier, diagnose infectious diseases with high molecular specificity, and treat gynecologic conditions with minimally invasive surgical systems.
Hologic operates a high-margin, razor-and-blade business model anchored by proprietary capital equipment placements (such as Panther and Dimensions mammography systems) that drive predictable, recurring consumable revenues through high-throughput molecular assays, biopsy needles, and surgical disposables. This synergistic model ensures robust customer stickiness, high switching costs, and strong operating profitability.
Chairman, President and Chief Executive Officer
President, Breast and Skeletal Health
President, Diagnostics Solutions
President, GYN Surgical and Medical Aesthetics
These officers report to the chief executive and are not part of the CEO timeline above.
Hologic faces ongoing macroeconomic volatility, supply chain pressures for precision optical and electronic components, healthcare staffing shortages impacting hospital capital spending, and intense global competition from diversified medtech giants such as GE HealthCare and Siemens Healthineers.
Stephen P. MacMillan has served as President and Chief Executive Officer of Hologic since December 2013, and assumed the role of Chairman of the Board in 2016.
Under MacMillan's leadership, Hologic successfully streamlined its operating portfolio, accelerated organic R&D innovation, completed accretive acquisitions like Mobidiag and Bolder Surgical, and achieved record profitability and cash flow.
Karleen Oberton serves as Chief Financial Officer, directing Hologic's global financial strategy, capital allocation, treasury operations, and investor relations.
Hologic's leadership includes dedicated division presidents overseeing Breast Health (Erik Anderson), Diagnostics Solutions (Jennifer Bennington), and GYN Surgical (Essex Mitchell), ensuring specialized operational focus.
Compare executive leadership tenures and strategic transitions
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