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 Our Team

Mark 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.


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).


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.


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.


TJ Galletta


TJ Galletta joined The Sunderland Group in February of 2019 after moving to Colorado from Rancho Cucamonga, California. As the firm’s Staff Accountant, TJ assists with an array of tasks, including tax preparation, bookkeeping and financial statement preparation. TJ earned his B.S. in Business Administration in 2014 followed by his M.S. in Accounting in 2017. Previously, TJ worked as an accounting manager at an LA-based technology start-up. He has since chosen to dive into public accounting in pursuit of his CPA. TJ spends his free time working with electronics, playing tabletop games and traveling.

Leah Leach Pic for Bio.jpg

Leah Leach


Leah joined The Sunderland Group in August of 2019. She is a Staff Accountant for the firm and assists our business clients with all things accounting and bookkeeping. Leah earned her B.S. degree in Communications from the University of Kansas in 2016 and is currently working toward an M.S. in Finance thru Colorado State University. Leah has worked in both marketing and accounting departments within the education and home-building industries. In what little free time she has, she loves to spend time with her husband and pets and she also enjoys playing soccer and going to the movies. Fun fact about Leah - she made the University of Kansas rowing team as a walk-on!

Heather Ritter Pic for Bio.jpg

Heather Ritter


Heather joined the Sunderland Group in September of 2019. She joins our great Accounting team and assists our business clients with their accounting and preparation of the financial reports for our clients’ management teams. She also assists our Tax Department during the “fun” tax season. Heather has a broad range of experience in customer service related industries including being a General Manager in the restaurant industry and several years of Accounting experience, most recently in the real estate and home-building industries. Heather moved to Boulder from the great state of Iowa in 2012. She enjoys training her puppy, snowboarding, and spending time with family and friends.




Aliquam bibendum, turpis eu mattis iaculis, ex lorem mollis sem, ut sollicitudin risus orci quis tellus. Donec eget risus diam. Donec eget risus diam. Donec eget risus diam. Quisque congue porttitor ullamcorper. Nulla lectus ante, consequat et ex eget, feugiat tincidunt metus. Mauris id fermentum nulla.