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About Us

About Our Firm

O'Donnell & Dennis, CPA's, LLC is committed to your success. We make it our business to know your business well enough to improve your tax position, capital position, business structure and benefits packages, acquisition potential, and much more. We earn our fees by adding value to your company and to your asset base.

We have learned a great deal since we began in this business, and we are ready to apply this knowledge to enhance your company's growth and success. Together we can conquer all of the intricacies of doing business in today's fast-paced economy.

We are looking forward to working with you!

Our Mission

Our mission is to help clients maintain financial viability in the present, while taking a proactive approach to achieve future goals. This requires open communication to reach an understanding of our clients' needs through research and sound analysis. O'Donnell & Dennis, CPA's, LLC is dedicated to meeting these goals with high standards of excellence and professionalism. We have been a staple of the area's business community for years, and pride ourselves on the level of esteem we have earned.

Our dedication to hard work has earned the respect of the business and financial community in and around the area. We believe this to be a direct derivative of our talent and responsiveness to our client base. Whether you are a current or prospective client, rest assured that individuals and businesses who choose O'Donnell & Dennis, CPA's, LLC receive competent and timely advice.

Our Team

Todd A. O'Donnell, CPA (303) 776-5908 Ext 15

Todd A. O’Donnell, CPA, has been in public practice since 1986. Todd has over 20 years of accounting and tax experience which includes working as a Sole Proprietor for over 15 years. He provides individual, business and fiduciary accounting and tax services as well and business consulting services.

Todd graduated from the University of Northern Colorado in 1986 with a Bachelor of Science degree. He is a member of the American Institute of Certified Public Accountants and the Colorado Society of Certified Public Accountants. Todd is an active member in the community, most recently as a member of the board of directors for the Tiny Tim Center.

Todd currently lives in Longmont with his wife Cathy and daughter Ryleigh. He has lived in the Longmont area since 1976 and graduated from Longmont High School in 1981.

Sam D. Dennis, CPA (303) 776-5908 Ext 12

Sam D. Dennis, CPA, has for more than a quarter century served a wide spectrum of clients in the practice of public accounting. Sam's background of expertise includes in depth experience in tax consultation, preparation and planning for individuals, partnerships, corporations, estates and trusts.

Since completing his baccalaureate degree in accounting in 1989 and prior to joining the firm in January 2015, Sam owned and managed a corporate public accounting practice in Maryland for the past more than two decades. With a license to practice accounting, Sam has been active in the State Accountancy Societies in both Colorado and Maryland. He also has served such charitable interests as the internationally recognized Congressional Hunger Center, where he regularly consulted and guided the board of directors in strategic planning.

With a long family history in Colorado, Sam and his wife, Michelle, take pleasure in hiking, relishing and appreciating the overall scenic beauty of the majestic Colorado mountains.

Louise M. Slaughter, CPA (303) 776-5908 Ext 11

Louise M. McCombs, CPA, joined the firm in January 2008. She brings over 30 years of accounting experience in multiple private industries. Louise provides accounting and tax preparation services for corporations, partnerships, limited liability companies and individuals.

Louise graduated Suma Cum Laude from Youngstown State University, Youngstown, Ohio in 2002 with a Bachelor of Science Degree in accounting.

Louise lives in Erie with her husband, Richard, and 2 dogs, Neiko & Harmony. She is a member of the Flat Irons Kennel Club, and the Swedish Vallhund Club of America.

Vivian E. Temple, EA (303) 776-5908 Ext 13

Vivian E. Temple, E.A., joined the firm in January 1981, as a tax preparation specialist. In that same year she received her Certificate of Enrollment to practice before the Internal Revenue Service. The certification indicates her qualification to represent taxpayers in matters concerning the Internal Revenue Service. She provides tax services for individuals, small businesses and fiduciary entities.

She is a member of the National Association of Enrolled Agents and the Colorado Association of Enrolled Agents. She has served as an instructor for the Colorado Society of Enrolled Agents.

Vivian and her husband live on a small ranch near Mead. They, along with their son, raise beef cattle.

Sheri K. Martinez (303) 776-5908

Sheri K. Martinez joined the firm in January 2020, as Administrative Associate. She has extensive secretarial administration of 25 years under her belt. She has been a resident of Longmont city for over two decades.

Sheri and her husband, Ken, have three sons and eight grandchildren. They enjoy camping in the beautiful Rocky Mountains and spending time with their family.