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Board of Directors

We thank the extraordinary individuals who commit their time, wisdom and resources to ACHA.

2026 Board of Directors:
Stephen Back DO Chair

Diagnostic Radiologist
Assistant Professor of Clinical Medicine
Oklahoma State University Center for Health Sciences
Partner-Diagnostic Imaging Associates
Tulsa, OK

William F. Causey Vice Chair

Retired Attorney
Washington, DC

Timothy Singletary Treasurer

General Partner, Apex One Capital
Houston, TX

Erin Walsh-Beguin Secretary

Senior Director, Global Recruiting Operations & Employer Brand, GoDaddy
Chandler, AZ

Yuli Kim MD Medical Advisory Board Chair

Director, Adult Congenital Heart Disease Center,
University of Pennsylvania, Philadelphia, PA

Peter Ermis MD, FACC Medical Advisory Board Vice Chair

ACHD Cardiologist, Director of Adult Medical Services
Texas Children’s Hospital
Baylor College of Medicine, Houston, TX

Melissa Gardner-Lomax Patient & Family Advisory Board Co-Chair

Vice President National Relationships, IPFS Corporation
Houston, TX

Meredith Rahn-Oakes Patient & Family Advisory Board Co-Chair

Governance Specialist, University of Iowa Health Care
Iowa City, IA

Lindsay Altimare MPA

Vice President Operations, Pediatrics, Lehigh Valley Reilly Children’s Hospital
Lehigh Valley Health Network (part of Jefferson Health)
Allentown, PA

Adam Bremberger

Financial Officer, Liberty Mutual
Boston, MA

Danijel Brener

Chief of Staff, Philips Respironics
Pittsburgh, PA

Chad Chase

Managing Principal - Senior Advisor, CGN Advisors
Manhattan, KS

Jonathan Cramer MD

Adult Congenital Cardiologist and Medical Director
University of Nebraska Medical Center & Children's Nebraska
Omaha, NE

Todd Crippin

Vice President, Provider Recruiting & Strategy, Optum
Overland Park, KS

Tiffany Hackett-Stuart RN

Primary Children's Hospital
Salt Lake City, UT

Nicole Jung

Vice President of Finance, Health and Science Technologies, IDEX Corporation
Minneapolis, MN

Matthew J. Martinho

Senior Wealth Planner, Merrill Lynch
New York, NY

Chelsea Shae Oliveto

Founder, Olive & Shae
Philadelphia, PA

Shankar Ramachandran

Vice President – Digital Marketing & Product Analytics, Barclays Bank
Wilmington, DE

Anne Stapleton Reilly

Retired, Development and Public Relations Professional
Naples, FL