About John Diak

A Douglas County resident since 1983, John Diak has been serving his community for decades — an experienced, disciplined, proven conservative dedicated to fiscal responsibility, safe neighborhoods, and a stronger future for families and businesses.

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As an elected official, John Diak has spent more than a decade serving Parker and the region through leadership roles on the Denver Regional Council of Governments, the E-470 Public Highway Authority, and numerous town committees. His record includes securing over a hundred million in federal and regional funding for transportation, reducing tolls and fees, and advancing policies that strengthened public safety, infrastructure, and cultural amenities. John’s extensive civic experience reflects a proven commitment to delivering results that improve quality of life for residents.

An Experienced Community Leader

A Disciplined Businessman

In addition to his civic leadership, John Diak brings decades of professional experience in finance, business operations, and client service. As Principal and Wealth Advisor at Oatley & Diak, LLC, he has guided families and businesses through strategic financial planning, investment management, and long-term goal setting. Previously, as a financial executive at Western States Surveying, Inc., he oversaw operations, accounting, and major infrastructure projects including work on E-470, Denver International Airport, and the I-70 Glenwood Canyon expansion.

John Diak has always stood for the principles that matter most to our community — fiscal responsibility, limited government, and accountability to the taxpayers. As a proven conservative, John has consistently worked to ensure that public resources are managed wisely, local families and businesses are supported, and government remains transparent and efficient. His record demonstrates a steady commitment to commonsense leadership rooted in conservative values.