Who We Are

  • George Gumbiner


    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 also involved in numerous non-profit and charitable organizations both here in Colorado and globally.

  • Stephanie K Ruark


    Stephanie is our newest team member to Marathon Investments. She brings with her 20 years of knowledge and experience in the retirement planning, investment and insurance arena; from 401(k)’s, 403(b)’s, SIMPLE IRA’s, college saving plans, to trust accounts and managed investment accounts, as well as life insurance and annuity planning.


    Stephanie's primary responsibilities include developing and implementing personal financial plans, reviewing investments, presenting educational and retirement workshops, creating hypothetical reports for clients, and continuing to assist our clients achieve their financial goals.


    Stephanie is a native to Colorado and loves to spend time outdoors camping, skiing and hiking with her husband and their blended family of a daughter and four sons.

  • Doretta Trotty

    Business Operations Manager

    With more than 20 years of experience in office and project management, Doretta is a results-driven professional who prides herself on helping improve profitability, efficiency and accountability. During her career, She’s helped manage multi-million dollar budgets, created an innovative financial reporting system, assisted several executive officers, led complex projects and served as a go-to, knowledgeable resource for each organization.


    Doretta is a Denver native with two beautiful daughters and is a grandmother and a great grandmother. Her hobbies include reading, spending time with friends and family and movies. She is also an active member in her church.

  • Genesis Fox

    Administrative Assistant

    Genesis comes to us with five years’ experience providing consistent approachable customer service for customers and vendors at Dish Network and other companies. 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.


    Genesis Fox was born in Jacksonville, Florida but has lived most of her life in Colorado. She loves going to the movies, playing PlayStation 4 and most importantly spending time with her boyfriend Spencer as well as her two dogs and cat.