About Us

Lumen CPA, Inc. is a full service public accounting firm located in the Cleveland, Ohio suburb of Brecksville serving clients wherever they may be. We combine smart technology, smart people, and smart processes with shared knowledge gained from over 25 years in the business to help you achieve your goals. Our success comes from your peace of mind and freedom to pursue the important things in life: faith, family, and friends.

Core Values

• Absolute integrity in all we do
• Continuous learning
• Sharing of knowledge
• Collaborating with other professionals
• Standardizing best practices
• Taking chances and learning from mistakes
• Celebrating victories without resting on our laurels
• Having fun
• Valuing people above all else and
• Trusting in God from Whom all blessings flow and all glory is due

Meet the Team

Martin F. Kopmeyer, CPA - President

Marty is the president of Lumen and responsible for leading company strategy and overseeing client services. He has over twenty five years experience providing accounting, assurance, tax, and advisory services gained at KPMG, a regional firm, and as a partner in a large local accounting firm. Marty launched Lumen in 2013 with a vision to create a firm that fully leverages cloud technology to solve the pain points of small and medium sized businesses and their owners while providing a truly flexible work environment for talented accountants and advisors.

Marty earned a BSBA with a major in Accounting from John Carroll University. He serves as Treasurer of the Board of Directors for Cleveland Right to Life, Inc., Cleveland Right To Life Education, Inc., and St. Joseph’s Businessmen Network. He is an active parishioner and serves on the finance council at Immaculate Conception Parish in Cleveland. He enjoys fishing, soccer, and spending time with his family. He lives in Brecksville, Ohio with his wife Julie and their three children.

Mary Jo Diekman, CPA - Director, Accounting & Assurance Services

Mary Jo is director of accounting and assurance services. She is a seasoned professional with over 25 years experience, most recently serving as Associate Vice President for Finance at Oberlin College. Prior to that she spent 12 years in public accounting working at EY and a local CPA firm and several years in management positions in the insurance industry with responsibilities for financial reporting and long-range planning. Mary Jo brings a unique perspective to our clients having held leadership positions within private companies as well as serving as an external auditor. 

Mary Jo earned a BSBA with a major in Accounting from Bowling Green State University and is a member of the Ohio Society of Certified Public Accountants. While at Oberlin College she served as chair of the Retirement Plan Committee and served as a mentor for several student interns. She has two children and lives in Hudson, Ohio, where she is a member of the Hudson Newcomers Club.



Barbara Morgan Popelmayer, CPA

Barbara is a 25-year veteran with experience in public accounting and private industry. Barbara’s work for our clients includes performing audits, reviews, and compilations of financial statements; preparing business and individual tax returns; and general accounting assistance for a broad range of closely-held businesses.

Barbara earned a BA with a major in Accounting from the University of Akron. She is licensed by the Accountancy Board of Ohio and is a member of both the Ohio Society of Certified Public Accountants and the American Institute of Certified Public Accountants.





David M. Gordon, MBA, CISA, CIA, CFE

David provides IT audit expertise in our service organization control engagements (SSAE 16 / SOC). He has over twenty years experience in the information security and technical audit profession and has provided support for numerous SSAE 16 / SOC 1 examinations. His experience covers many aspects within the information technology audit field and ranges from general control reviews up to hands-on attack and penetration reviews.

Dave earned a BS in Accounting and MBA from the University of Akron. He was previously the President of the Cleveland chapter of the Institute of Internal Auditors (IIA) and served as President of the Cleveland chapter of the Information Systems Audit and Control Association (ISACA). Dave volunteers his time as Vice President and one of the assistant coaches for Wadsworth Youth Football and also serves as a coach for the Wadsworth Lacrosse Club. Dave enjoys golf, football, and basketball. He and his wife, Amanda, live in Wadsworth with their two children.

Elisa R. Burchett

Elisa brings our clients over a decade of diverse experience including public accounting and as director of finance for two non-profit organizations. She provides outsourced accounting and controllership services to organizations and is an instrumental member of our audit and review engagements.

Elisa earned a BS in Accounting from the University of Akron. When she’s not crunching the numbers, you might find her whipping up a batch of natural rubs, blends, or balms for Original You – a company she founded. Elisa lives in Akron, Ohio with her husband and daughter.

Julie E. Kopmeyer, MA

Julie is primarily responsible for keeping Marty in line. She provides invaluable insight into our company strategy, communications, and technical writing. She has worked as an editor for a trade magazine and as a corporate communications consultant for advertising and public relations agencies.

Julie earned a BA with a dual major in English and Communications from John Carroll University and an MA in English from the University of Akron, where she taught freshman composition. Julie is a homeschooling mother, runner, reader, and champion for the unborn. She lives in Brecksville, Ohio with her husband Marty and their three children.