OAG Board of Directors
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AnesthesiologistEric Bean, MD, MS
Chair -
AnesthesiologistMelissa Welker, MD
Chair Elect -
AnesthesiologistAri Tallen, MD
Secretary -
AnesthesiologistNikki Jaworski, MD
Treasurer -
AnesthesiologistShane Lee, MD
Board Member -
AnesthesiologistMurtaza Diwan, MD
Board Member -
AnesthesiologistMichelle Smith, MD
Board Member -
AnesthesiologistAndy Neice, MD
Ex-Officio Board Member
Clinical Leaders
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Anesthesiologist
Andy Neice, MD
Chief Medical Officer -
AnesthesiologistLuke Parr, MD
Critical Care Medical Director -
AnesthesiologistRahul Raghavan, MD
Clinical Quality Director -
AnesthesiologistAbbie Tirrell, MD, MPH
Physician Billing Compliance Officer -
AnesthesiologistOmar Halawa, MD
ASC Medical Director
Corporate Leadership
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Lorissa Addabbo
Chief Executive OfficerAs Chief Executive Officer, Lorissa oversees the business, administrative and financial operations of the corporation. Her staff addresses compliance, contracting with hospitals and ambulatory surgery centers, insurance reimbursement negotiation, physician & CRNA recruitment, scheduling, credentialing and information technology.
Lorissa brings a wealth of expertise and leadership to OAG. Most recently, she served as Vice President of Anesthesia, Surgical Services, and Neuromuscular Service Lines at Salem Health, which informs her first-hand knowledge of OAG’s value and quality. During her tenure she realized that she prefers to work for independent practices, as she had done for seven years as the CEO of Hope Orthopedics. Her earlier leadership roles at Adventist Medical Center, Aldrich Advisors, and Salem Health round-out her extensive knowledge of the Pacific Northwest healthcare market.
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Trang Nguyen
Director of OperationsTrang has been with OAG for nearly 20 years. As Director of Operations, Trang is an integral member of the Executive Leadership Team and provides a high-level of support to the Executive Leadership Team and Board of Directors at OAG. Her responsibilities include overseeing the staffing efficiencies of OAG’s clinical workforce for optimal practice management, and various other projects that support an integrated approach for organization-wide improvements.
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Micheal McCarthy
Human Resources DirectorMicheal joined OAG in 2016 as Human Resources Director. In his role, he is responsible for all recruitment activities, human resources and credentialing, employee relations, patient satisfaction surveys, performance reviews and leadership development.
Micheal has a Bachelor of Arts in Management and Organizational Leadership from George Fox University, and a Master of Science in Counseling Psychology from Lewis and Clark. He has more than 20 years of experience in Human Resources working with companies in retail, technology, healthcare, and most recently an international design firm.
Micheal and his wife have 2 great kids, and a feisty jack russell terrier. He enjoys the outdoors of the Pacific Northwest and is an avid trail runner.
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Siân Williams
Associate Director, Revenue Strategy and OperationsSiân overseas all area of payor contract management. She has over 20 years of experience in healthcare. She received her Bachelors from University of Oregon.
Siân joined OAG in 1993 and brings 14 years of experience managing payor contracting, negotiations, and analysis. Sian serves as billing liaison to our billing vendor, serves on various internal billing committees and is a non-voting member of Legacy Health Partner’s Finance and Contracting Committee. Prior to becoming OAG's Payer Contract Manager, Siân served in various roles ranging from Contracts Analyst, Contracts Administrator and Quality Assurance Administrator, overseeing risk management, credentialing and contract coordination.
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"Ren" Hongbao Ren
Finance DirectorRen is an experienced healthcare manager with over 20 years of experience overseeing all financial functions including accounting, budgeting/forecasting, financial proforma, cost/benefit analysis, business planning, patient cost accounting, benchmarking, physician comparison/reporting, labor productivity, and financial performance management at the hospital as well as at health system level.
Ren’s professional journey began as a CPA assistant at a small firm, where she later advanced to the role of senior financial analyst at US Bancorp. In 1997, she joined Legacy Heath, where she dedicated over 25 years to various aspects of healthcare finance. Ren culminated her tenure at Legacy Health as finance manager at Legacy Emanuel Medical Center.
As OAG’s Finance Director, she oversees the entire financial operations of the Corporation as determined by the policies of the Board and the CEO. The Finance Director oversees all financial functions including accounting, budget, credit, insurance, tax, financial audits, and treasury. Ren designs and coordinates a wide variety of accounting and statistical data and reports. She assists the CEO with establishing and maintaining banking relationships, vendor activities and relationships, and leading executive level finance projects.
