2026-2027 ASCPA Board of Directors

Oliver Yandle, JD, CAE, is president & CEO of the Arizona Society of CPAs, where he represents a membership of approximately 4,200 CPAs and leads a staff of 12. Yandle previously served as executive director of the Association of Legal Administrators, the largest international organization providing support to people in the legal management profession. He has held CEO-level positions for other associations. Currently, he serves as a volunteer director-at-large on the CPASEA Board of Directors and is a member of the National Association of State Boards of Accountancy State Society relations committee. He is active in the American Society of Association Executives, where he holds the Certified Association Executive designation, and the Association Forum of Chicagoland, where he served as chair of the Board of Directors. He has been recognized by Crain’s Chicago Business as a member of the first class of Chicago’s Notable LGBTQ Executives. Yandle is a native of Louisiana and holds a bachelor's degree in journalism from Loyola University of the South in New Orleans, and a JD from Washington College of Law at The American University in Washington, D.C.

Joseph L. Heidleburg, CPA, is currently an international accounting manager with Align Technology, Inc. In his role, he helps to execute and coordinate accounting performed by international accounting teams within Align. Heidleburg has a varied history within accounting and auditing, as he spent seven years in public accounting with REDW where he served mostly tribal government clients. He spent three years as a senior accounting analyst with Starwood Hotels and Resorts and five years within internal audit as a principal auditor at Wells Fargo Bank, with a focus on financial crimes. He received his Bachelor of Science in Accountancy from Arizona State University.

Lisa S. Parke, CPA, is an audit and assurance partner of Walker & Armstrong, LLP, a mid-size local public accounting firm with over ten years of public accounting experience. After over a decade of service in the United States Army as a biomedical electronic technician and Apache crew chief, Parke returned to school for a degree in accounting, graduating Summa Cum Laude from the University of Arizona’s Eller College of Management. She previously worked in the private sector, managing the accounting for several entities of a multi-million-dollar corporation before moving into public accounting where she has had a successful career working with various sectors on assurance services. Parke has been instrumental to team members and clients in the implementation of new accounting principles. Parke is also an Arizona local who is invested in the community. She became involved with Pima Federal Credit Union many years ago after seeing an opportunity and wanting to volunteer her expertise to help lead the organization.

Jessica Iennarella, CPA/CFF, CFE, is the Chief Financial Officer for the State Bar of Arizona. Prior to joining the State Bar, she spent eight years in forensic accounting, calculating economic damages and investigating employee dishonesty. As a graduate of the AICPA’s 2016 Leadership Academy, she is passionate about developing and evolving the profession. She is currently involved on multiple committees within the AICPA, as well as being an active supporter of the Arizona Humane Society.

Nathaniel Keith Eggman, CPA, is a native Tucsonan and a second generation graduate of Amphitheater High School. He has a bachelor’s degree in accounting from the University of Arizona Eller College of Management and an MBA with a concentration in accounting from the University of Phoenix. Eggman started his accounting career at Town West Realty Inc, a local development and property management firm in Tucson. When the market crashed in 2008, he was laid off and decided to get his MBA. While working on his MBA Eggman was hired by Gabrielle M. Louma CPA PLLC (GML). He made the transition to R&A CPAs in 2011. Over the past 10 + years at R&A, Eggman have grown into the CPA that he was determined to become and has gone from an associate to becoming a partner in 2022. He partners with businesses and individuals to help them succeed with their goals, and hopefully at the same time minimize their taxes.  Eggman am currently a secretary of the El Rio Health Center Foundation, he has been on the board since 2022

Eugene Park, CPA, is a consulting partner with Heinfeld, Meech & Co. P.C. He specializes in providing consulting services to local school districts and nonprofit organizations, helping them navigate financial planning, budgeting and compliance with governmental regulations. His expertise includes advising on the development and implementation of financial systems, internal controls and long-term fiscal sustainability. In addition to his consulting work, Park is involved in the professional development of staff associates and serves as the lead recruiter for the Phoenix office. He has been an active member of several committees within the firm, including client conference planning, wellness and fun committees. Outside of the firm, Park has contributed to the accounting profession through his roles on the ASCPA’s Leadership and Growth Alliance committee and the AICPA’s Young Member Leadership Committee. Park holds a Bachelor of Science in Accounting from the University of Arizona and earned the AICPA Advanced Single Audit Certificate in 2016. He is also a graduate of the AICPA Leadership Academy in 2019.