Our Team

The O’Brien Group team is one of the nation’s premiere collections of talent in executive leadership consulting. Not only do each of our team members bring deep on-the-job experience leading complex organizations themselves, but each brings an uncommon level of curiosity and emotional intelligence that has set them apart from their peers. Read on to get to know us — we look forward to getting to know you, too.

Dr. Michael O’Brien

Dr. Michael O’Brien

President & CEO

Dr. Michael O’Brien, O’Brien Group’s CEO, one of the country’s foremost executive leadership educators in the healthcare industry, has been a pioneering force in helping senior executives and their teams lead better and achieve more in the face of some of the most dramatic changes the industry has ever seen.
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Mark Shunk

Mark Shunk

Senior Partner

Using his unique combination of strategic business vision, leadership energy and management experience, Mark Shunk pursued a number of innovative and successful business ventures in a wide array of corporate and entrepreneurial settings.
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Jane Crowley

Jane Crowley

Senior Partner

Jane has been a senior leader in integrated Catholic healthcare systems for 34 years. From 2000 to 2017, Jane was Executive Vice President of Mercy Health based in Cincinnati. During her tenure at Mercy Health, Jane served as a Divisional EVP, Chief Administrative Officer, and Chief Transformation Officer.
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Rob Linn

Rob Linn

Senior Partner

Rob Linn has been advising senior executives since 1985, partnering with over 300 executive teams to help them optimize their leadership and their organization’s performance.
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Dennis Tirman

Dennis Tirman

Senior Partner

Dennis Tirman has 25 years of experience in successfully engaging executives to understand and achieve individual and organization change.
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Challis Lowe

Challis Lowe

Senior Partner

As a “C” suite HR executive Challis has a proven track record as a highly skilled business partner who has provided strategic counsel to the CEOs of the organizations for which she has worked as well as the CEOs on whose boards she has served.

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Tom Tomai

Tom Tomai

Senior Partner

Tom Tomai is a proven executive with extensive line-leadership, change management, and turnaround experience across a broad spectrum of industries including financial services, healthcare, human capital consulting and IT.


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Karen Romero

Karen Romero

Senior Partner

Karen’s expertise in nursing, health information technology and executive coaching enables her to quickly understand complicated organizational situations and help her clients implement practical leadership solutions.
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Tim Hayes

Tim Hayes

Senior Partner

Tim Hayes knows first-hand how to run a multi-billion dollar organization while developing great leaders and teams. He served for 15 years as President of North America for Bayer’s industry-leading Consumer Healthcare Division.
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Gordon Barnhart

Gordon Barnhart

Senior Partner

A partner with the O’Brien Group since 2010, Gordon Barnhart has been consulting with organizations and communities on leading change for over twenty-five years.

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Bruce D. Cummings

Bruce D. Cummings

Senior Advisor

Thought-leader, strategist, and change agent, Bruce D. Cummings has been a successful hospital/health system CEO for 26 years and an innovative health services executive for 40.
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Bridgette Thomas

Bridgette Thomas

Vice President, Strategic Relationships

Bridgette has devoted her professional career to helping leaders expand their capacity for growth. With more than 20 years of HR experience, Bridgette has partnered with the executive suite to develop strategy, organizational structure and talent.
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Gregg Davidson

Gregg Davidson

Senior Advisor

Gregg’s career has spanned over 40 years in healthcare, and he is recognized for contributions in the areas of senior executive leadership, strategic visions, and community involvement and leadership.
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Peter Plantes

Peter Plantes

Senior Partner

Peter J. Plantes, M.D. has three decades of experience creating service and delivery solutions that enhance marketplace success and clinical performance for clinical practice groups, academic faculty group practices, hospitals, health systems, and health care organizations.
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Beverly O’Brien

Beverly O’Brien

Vice President

Beverly has been with the O’Brien Group since she and Dr. O’Brien co-founded the company in 1992. Balancing the ever-changing demands of an entrepreneurial company, she has continually adapted her role to help the company meet our clients’ needs and facilitate our growth. She supports the office staff and consultants, overseeing Finance, Information Technology, Human Resources and other administrative operations.
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