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George Gumbiner

Founder & President

Money is a tool, in and of itself doesn’t bring you fulfillment; it’s the means to achieve whatever is important to you, to realize during your lifetime. George, a native of Denver, received a BA and an MA in public administration from the University of Colorado in Boulder. He has also studied at  the Hebrew University of Jerusalem, 1973-1974. Since graduation, Gumbiner has been in the employ of Bank Leumi le Israel, Omnibancorp and MDC Holdings, along with three major investment companies, E.F. Hutton, Prudential Securities and A.G. Edwards & Sons, Inc., the latter for over nine years. He is involved in numerous non-profit and serving charitable organizations both here in Colorado and globally, when he’s not hiking trails with his daughter Talia and his ever trusted companion Charlie.


Stephanie K Ruark

Vice President - Planning & Investments

Your tool box, a resource to help you plan and reach your goals. Stephanie is truly invested in each of you, your families and preparing for the next generation. She brings with her 20 years of knowledge and experience in retirement planning, investment and insurance arena. Stephanie loves exploring the outdoors and has a heart to volunteer, with various charitable organizations; her son’s school, Make-A-Wish, Cherry Hills Community Church and Open Arms Food Bank.


Genesis Fox

Vice President - Operations

Maintains and oversees the day to day operations of the office while providing administrative support when needed. Genesis has been with Marathon for 5 years servicing and getting to know each client. She is very personable and has high standards of excellence in her work ethic. Genesis also displays outstanding communication skills, continuously projecting a highly professional image while adapting quickly to new and evolving changes within the industry. She enjoys going to the movies, finding new adventures, capturing the Colorado scenery with her dog and volunteering at various local churches.


Denise Caldwell

Office Administrator

She is who you talk to when you call & the first person you see when visiting Marathon. Denise is dedicated to providing exceptional customer service to all of our clients and loves hearing from you! She handles all your administrative needs and appreciates your business so much! During her off time, she enjoys puttering around in her garden, reading science fiction, going to the movies, and hanging out with the family hiking and exploring the beautiful Colorado landscapes.