Come Grow With Us

Mark Christiansen Associates LLC Accounting Firm, Aurora, CO.

Meet Our Staff


Mark Christiansen, 
Owner/Accountant/Insurance Agent

Mark established Mark Christiansen Associates, LLC in 1986.  Mark focuses primarily on providing creative, cutting edge tax, accounting and estate planning to business entrepreneurs and other individuals. Mark brings 30 years of experience and an extensive background in tax and accounting for a wide variety of small and large businesses including non-profit organizations. Mark has maintained his insurance license and provides annuity and life insurance service to his customers.

Mark is a graduate of Regis University, Denver, Colorado and has enjoyed being in public accounting for over 30 years. He established Mark Christiansen Associates, LLC in 1986 specializing in tax, bookkeeping and payroll services to small business owners and individuals. Mark is a member of the National Society of Accountants. Mark enjoyed 23 years of teaching as a faculty member at Aurora Community College.

Mark is a single dad. When Mark is not at the office, he can be found enjoying the outdoors on the golf course.  He has celebrated 8 hole in ones at various golf courses.  Mark enjoys travel and vacationing with his family.


Suzanne Marquez, Accountant/Bookkeeping/Payroll

Suzanne is a accountant, bookkeeper and payroll specialist at Mark Christiansen Associates, LLC where she primarily focuses her attention on daily/weekly bookkeeping and payroll services. Suzanne also meets customers needs by making use of her accounting and tax experience as well . Suzanne has been a true asset to both Mark Christiansen Associates, LLC and to our clients since 2004.

Suzanne has 45 years of accounting, payroll and tax experience with 30 of those years as owner of her own firm. Her experience has included a variety of small business and experience with both the construction industry as well as oil and gas finance. Suzanne has taught college level accounting, management and finance. She graduated from the University of Chicago. Suzanne is a member of the National Accountant Society, National Bookkeeper Association and is a Certified Toastmaster.

Suzanne enjoys travel and family.

Dan Radcliff, Accountant 

Dan is an accountant with Mark Christiansen Associates, LLC where he primarily focuses his attention on monthly and quarterly compilations, tax preparation and client satisfaction. Dan is always up for a challenge and is very detail orientated.  Dan has been an asset to both Mark Christiansen Associates, LLC and clients since 2007.

Dan has over 35 years of professional experience with private companies and non-profit organizations with accounting, taxation and business advisory services. He specializes in small business accounting and taxation.  Dan's hands on experience as a CFO and Controller enables him to relate to the challenges facing business leaders, and identify a solution that complements a client's business objectives. His experience covers a broad range of industries including: wholesale, retail, construction, business to business services and products, publishing and satellite and telecommunications.  He graduated from Washburn University, Topeka, Kansas with a BA in Accounting and Business.

Arlene Pizarro 

Arlene has been working with Mark Christiansen Associates since her Junior year in high school. Currently she is working to complete her bachelor’s degree in computer science and plans on adding an Accounting degree. Arlene holds the title of Executive Assistant supporting Mark, Suzanne, and Dan. She is experienced in Quick books, Tax Preparation software. Some of her duties include managing the phones and working directly with clients.

Arlene has become a valuable addition to the Mark Christiansen Associates team. Her spare time is spent on her scholastic studies, fishing reading a good book and jig saw puzzles.


Tax Due Dates