Shereen E. Mahoney, CPA
CEO
As CEO, Shereen Mahoney is accountable for aligning our team around our core mission. She leads our executive team in creating and communicating the firm’s vision, values, and strategy. Shereen also oversees the Microsoft Learning Solutions Center at Brittenford Systems.
Shereen previously was a Managing Director of a professional services team at Brittenford Systems. Shereen began her career as a consultant at PricewaterhouseCoopers. She was promoted to the role of manager, and helped build and lead a consulting practice group focused on accounting system implementations and support.
A graduate of James Madison University, Shereen holds both BBA and Masters degrees in Accounting. She is a Microsoft Master Certified Professional for both Dynamics SL and Dynamics GP. She is a Microsoft Certified Trainer, and since 2007 has served on the Microsoft Dynamics SL Partner Advisory board – one of only 20 partners nationally to do so.
Brian J. Dietz, CPA
President

As president, Brian manages the firm’s operations, sales, finances, and technology infrastructure.
He is responsible for developing and executing the strategic plan, building an effective management team, ensuring that our client satisfaction levels reflect our best efforts, and ensuring that our core values are reflected in everything we do.
Brian previously held executive-level positions at PricewaterhouseCoopers, PictureVision (a subsidiary of Kodak) and The Hamilton Securities Group.
Brian is a CPA. He holds an undergraduate degree from Virginia Tech, and an MBA from Virginia Commonwealth University.
Ryan E. Risley
Chief Technology Officer
Ryan leads our CIO Services Practice where he partners with our clients CEO, CFO’s to help IT divisions align with business. His extensive experience and holistic approach helps demystify IT helping leadership make better decisions. Ryan also oversees all of our IT systems and manages vendor relations. He defines, communicates, and executes our technology strategy with the mission of empowering our consultants to deliver the highest quality service to our clients.
His previous experience includes work with in pharmaceuticals at AAI Pharma and government contracting with Project Performance Corporation. He leverages his work with large multi-national organizations on global application deployments to bring best practices to all our clients.
Ryan earned his Bachelors in Environmental Studies with a concentration in Chemistry and honors in Biology from the University of North Carolina Wilmington. He then earned his Masters of Science in Information Systems Technology with a concentration in datawarehousing and Chief Information Officer Executive Certificate from George Washington University.
Ryan is actively involved in all aspects of the community and Brittenford’s philanthropic efforts. He is a member of the Omicron Delta Kappa Fraternity, a member of Sigma Phi Epsilon Fraternity, a Guest Lecturer at the George Washington University, and an Eagle Scout. Ryan has been recently elected to serve as the President of the Washington DC Chapter of the IAMCP.
Matt Rowley
Chief Operating Officer

As Chief Operating Officer, Matt is responsible for professional services, client delivery, and product development. His focus is to develop and maintain superior client relationships through excellent solution delivery, while driving growth of the firm. He works closely with all practice areas of the firm to provide clients with an outstanding Brittenford experience.
Matt also manages the “Gold” client service team and is responsible for their professional development. He leads practice areas that implement and support Microsoft Dynamics SL, Intacct, and Host Analytics. He has extensive experience in leading complex business and technology transformation efforts, including financial management systems, forecasting and reporting, and system integrations. He is adept at understanding client visions and couples industry experience to architect technical solutions and project teams that deliver functional results.
Matt received his Bachelors of Science in Integrated Science and Technology and an MBA from James Madison University. He also holds an Executive Certificate in Management and Leadership from Massachusetts Institute of Technology.
