Client Portal Login

Join a Meeting

Why We Are The Smart Choice For Your Business

About The Sunderland Group

The Sunderland Group is a Boulder, Colorado-based CPA firm committed to helping our clients achieve success and realize their goals and dreams. We specialize in providing accounting, payroll, tax and consulting services to small businesses and personalized tax services to individuals. Our experienced, well-credentialed staff provides our clients with the confidence and peace of mind that they are on the right path. We are responsive and convenient to work with, and are there when you need us.

The Sunderland Group utilizes advanced technologies to support real-time information sharing, and our regular face-to-face or virtual strategy sessions maintain a highly personal and educational experience. We are a company that unites leading-edge technologies, personalized interaction, and dedicated expert service to create customized solutions designed specifically for you and your business.

To get started on the exciting journey of strengthening, streamlining and growing your business, we invite you to call or email us with your ambitions, and we’ll explain the many ways we can help you get there.

Meet Mark R. Sunderland

With more than 20 years of accounting experience, including respected positions with Ernst & Young and Merrill Lynch, firm president and founder Mark R. Sunderland is a hands-on authority on comprehensive business planning, tax planning and preparation, accounting system set-up and training, financial documentation, and technology systems training and implementation. He and his tech-savvy team specialize in the unique needs of small businesses, providing expert guidance and counsel on the surest track to financial safety, strength and growth. We keep you ahead of the curve all year round, preventing inaccuracies, tax surprises and penalties, late filings and hidden costs. We quote our fees up front, without strings or gimmicks, and provide shrewd and aggressive support to help you time every financial move perfectly. Mark enjoys everything the Colorado outdoors offer, particularly cycling, running, and camping in the mountains. He loves spending time with his wife Pam, boys Tyler & Ryan, and their dog Wrigley.

Meet Jon Gemme

Jon joined The Sunderland Group in May of 2014 after moving to Boulder from Cape Cod, Massachusetts. As our Accounting Manager, he assists with bookkeeping, QuickBooks consulting, payroll processing, tax preparation, and financial statement preparation. Jon concluded his studies at the University of New Hampshire after receiving a B.S. in Accounting in 2009 as well as an M.S. in Accounting in 2010. After college, he began work with an accounting firm near his hometown on Cape Cod where he remained working until his move to Boulder. When away from the office, Jon enjoys traveling, playing music, and participating in a wide range of outdoor activities. He is also an avid Boston sports fan (but we won’t hold that against him).

Meet Cora Solem

Cora joined The Sunderland Group in November 2012. She is the Office Manager and assists with tax preparation, bookkeeping and QuickBooks consulting.  Cora has earned a B.S. degree in Computer Science from CSU. She worked in a development environment as a Software Engineer for ten years.  Most recently, Cora has spent the past seven years working as the office manager in the Tax and Financial Planning industry, which had her involved in all aspects of the business. Cora is married and has two kids. She loves spending time with her family. Her interests include hiking, jogging, and gardening.

Meet Heather Hall

Heather joined The Sunderland Group in November of 2017.  She is our most recent addition to our Bookkeeping department and is involved with all the responsibilities in helping to maintain client accounts.  Heather has over 15 years of experience in the accounting field, and excels at helping small businesses to maintain all aspects of Bookkeeping, Payroll, Accounts Receivable, and Accounts Payable.  Heather holds a Master’s Degree in Music and maintains an active piano studio in Erie.  In her spare time, Heather can often be seen Music Directing and performing in the orchestras and bands of various Theatre venues around Colorado.  Family is very important to Heather.  She loves sharing her passion for life with her son and her dogs Kitty and Karma.


Any company can tell you how great they are, but we think the best testament comes from our clients. Below are statements from actual Sunderland customers, who kindly volunteered to share their experiences with our firm.

“When our company needed to hire a CPA to do our taxes, we knew Mark was our guy. We’ve known him for about fourteen years and have always respected him, so it was an easy choice. We’ve been a client for three years now and are impressed that The Sunderland Group is always available to us, no matter what type of question we may have – everyone is knowledgeable, helpful and quick to respond. We love working with Mark and the company, and always refer them to our friends and associates who are in need of a reliable, knowledgeable CPA.”

“We also appreciate getting the newsletter, which always contains the latest industry information. We highly recommend The Sunderland Group.” -Michael L

“I am a small business owner/ designer. It’s just me and my contractors, so I didn’t know how much help a CPA could offer. But after I realized I needed professional help with tax returns, I went in to see Mark. Mark not only helped with that, he also reviewed my company’s profile and suggested I could save money and protect my assets if I set the company up as an S-Corp versus a sole proprietorship. It was knowledge that I didn’t have and it made a real difference. I’ve got nothing but good things to say about Mark. I’m sure there will be more services I will use as my business continues to grow.”-Ben T.

“When Flaxen relocated to Colorado a few years ago, my staff and I became consistently frustrated with the attitude and lack of service we were getting from our former CPA, so when a successful business associate recommended Sunderland, we were happy to switch. Mark treats us with respect, and has become a real friend. I appreciate his entire staff’s ability to address any need that arises with prompt attention and accurate info.

“The Sunderland team understands the challenges that come with operating a creative service business, and presents workable and efficient ways to do important but time-consuming, laborious and confusing tasks. They take so much off my plate I can focus on the creative and growth elements of my business. I love knowing my company is in good hands.” -Amy C.

“My company has relied on The Sunderland Group for about ten years now. My previous CPA was disinterested in doing payroll and helping my business manage its contract budgets and proposals, and he made some very costly mistakes that affected both my company and me personally.

“Mark from Sunderland has an expert understanding of payroll, accounts payable and receivable, county contract and bank account reconciliation, tax and audit preparation – everything. He cleaned up a huge inherited and self-made mess, and even networked on my behalf, putting me in touch with the right banker, mortgage company and insurance company to promote my business’s success. He and his staff have also devoted their time to making sure I understand the complex situations related to my business, which has been invaluable.”-Marsa W.

“I chose Sunderland because a good friend recommended Mark, and I have been using his services for eleven years. Mark and his staff’s attention and responsiveness have always been great.” -Wesley H.