After graduation, Mr. Dingwall worked as Executive Secretary of the Seattle Municipal League. In 1945 he joined the team of then-Mayor William F. Devin where he ultimately became Executive Secretary to the Mayor. In 1951 he accepted a position as the Executive Director of the Washington Research Council, a watchdog taxpayer group.

In 1957 he was named Vice President and General Manager of the upcoming 1962 Seattle World’s Fair. The logistics and challenges of this project were enormous, and he found himself working 14-hour days coordinating ceremonies, dealing with foreign dignitaries, and resolving public relations aspects of the job. As a showcase for science and technology, Seattle’s Century 21 World’s Fair was a huge success thanks to Dingwall’s management skills, vision, and untiring effort to promote the event locally and throughout the world.

After the fair closed, Mr. Dingwall worked as a consultant for many other fairs in a number of cities. He later returned to Seattle as Interim Director of the Pacific Science Center until then-Mayor Charles Royer asked him to manage the Seatlle Center and get it back on track. The Seattle Center and its famous icon, the Space Needle, remain as a legacy and a tribute to Ewell Dingwall. He also served as mentor to several persons who went on to achieve prominence in civic work.

Mr. Dingwall passed away in 1996.