Prior to owning the Pilots, Soriano served as president of both the Pacific Coast League and the Western International League. Soriano also pitched in the minor leagues for several years before becoming the owner and player-manager of the Yakima Bears.
When Soriano won the Pilots expansion franchise in late 1967, he didn't have enough money to pay the franchise fee. In what proved to be a harbinger of things to come, he had to ask for help from former Cleveland Indians owner Bill Daley — who, ironically, had nearly moved the Indians to Seattle earlier in the 1960s. In return, Soriano sold Daley a 47 percent stake in the team, making him the largest shareholder. Soriano, however, retained the team presidency. Largely due to being badly undercapitalized, Soriano was nearly out of money by the end of the 1969 season.
Almost as soon as the season ended, it was apparent that Soriano wouldn't be able to hold out before moving to a new stadium. It was also apparent that the timetable for a new park would have to be significantly advanced, as the Pilots' temporary home, Sick's Stadium, was completely inadequate even for temporary use. Soriano put the Pilots on the market, but no credible offers surfaced from Seattle interests. Out of desperation, Soriano cut a deal to sell the franchise to a Milwaukee-based group led by Bud Selig. However, legal action dragged out throughout the 1969–1970 offseason. Ultimately, Soriano took the team into bankruptcy, clearing the way for Selig to take control and move the Pilots to Milwaukee as the Milwaukee Brewers. After the move to Milwaukee was finalized in late March, Soriano and his brother Max were hung in effigy in Seattle. After seven summers without major league baseball in Seattle, the expansion Mariners began play in 1977.
Born in Prince Rupert, British Columbia, Soriano moved to Seattle with his family when he was five. He played baseball at Franklin High School in Seattle; among his teammates on the Quakers were Fred Hutchinson and newspaper columnist Emmett Watson.
- "Dewey Soriano dies at 78". Ellensburg Daily Record. Washington. Associated Press. April 1, 1998. p. 11.
- Cour, Jim (September 23, 1981). "Ex-Pilot boss Soriano sees roses for M's". Spokesman-Review. Spokane, Washington. Associated Press. p. C4.
- "Dewey Soriano joins Rainiers". Seattle Daily Chronicle. Washington. Associated Press. September 21, 1950. p. 37.
- "Dewey Soriano quits baseball". Ellensburg Daily Record. Washingotn. Associated Press. June 4, 1951. p. 6.
- "National League to expand; Seattle franchise official". Spokesman-Review. Spokane, Washington. Associated Press. December 2, 1967. p. 14.
- "Pilots officials hung in effigy". Ellensburg Daily Record. Washington. UPI. March 27, 1970. p. 5.
- "Fred Hutchinson goes to final resting place". Sarasota Journal. Florida. Associated Press. November 17, 1964. p. 14.
- Career statistics and player information from Baseball-Reference (Minors)