John J. Diak,  CFP<sup>&reg;</sup> - Financial Advisor

John J. Diak, CFP®


Oatley & Diak LLC

18801 East Mainstreet, Suite 240
Parker, CO 80134
(303) 221-1900


John Diak is a CERTIFIED FINANCIAL PLANNER™ professional and member of the Financial Planning Association. Serving clients at Oatley & Diak LLC in Parker, CO and the surrounding communities.

Financial Advisor Overview

Oatley & Diak, LLC is a fee-only, family owned registered investment advisory (RIA) firm that provides financial advisory services to individuals, families, trusts and businesses. Our mission is to treat clients like they are a part of our family – providing personalized and timely service to achieve goals. Each relationship is unique – we listen to your personal situation and then develop a plan to achieve your unique goals. We value the client relationship – spending as much time with the client as needed in order to educate, monitor and review their plan. For further information, please visit at


Financial Advisor Experience

John has over twenty years of personal and corporate finance experience. Previous to becoming a CFP® in 2009, John's tenure as CFO and owner of a mid size professional service company provided experience in all phases of running a business - from general administration and financial management to cost and tax preparation accounting and retirement plan administration. He is positioned to be an effective planner in the personal and corporate world because of his familiarity with various industries, experience with governmental entities and his educational background that adds an additional layer of knowledge that helps him to better meet clients' needs. John holds a BS in Business Administration/Finance, a BS in Human Development and Family Studies from Colorado State University, a Master’s degree in Finance from the University of Colorado Denver and a Financial Planning Certificate from Metropolitan State College. John has been repeatedly recognized by 5280 Magazine as being one of "Denver's Top Wealth Managers".  John is a member of the Financial Planning Association and has volunteered his time to further the profession and taught financial planning and literacy through his local church.  Diak has also been involved in a variety of community activities and organizations including the Rotary Club of Cherry Creek Valley and the Financial Coaching Ministry at Southeast Christian Church. In addition, he has donated professional services to local organizations including Praying Hands Ranch, Parker Senior Center, Double Angel Ballpark and the Miller Safety Center.

Financial Advisor Certifications

Securities Registrations or Exam Qualifications


Designations & Certifications


Insurance Licenses

  • Life insurance
  • Health/disability insurance

Broker-Dealer Affiliation


Financial Advisor's Specialties

Comprehensive Financial Planning, Budget & Debt Management, Attending College, 401(k)/403(b)/IRAs, Charitable & Planned Giving, Asset Allocation, Business Taxes, Career Change, Estate Planning, Corporate Finance, Investment Management, Getting Divorced, Employee Benefits, Irregular Income, Getting Married, Mutual Funds, Job Loss, Life Planning, Retirement, Stocks & Bonds, Starting a Family, Succession Planning, Sudden Wealth, Medical & Health Issues, Men's Finances, Nontraditional Households, Special Needs, Personal Taxes, Women's Finances


Helpful Financial Planning Resources