Coach Pyatte has probably had more influence on amateur baseball in Snohomish County than anyone having been involved in the local baseball scene since 1962. He would play one season at Western Washington University, but then moved to Everett returned to semi-pro ball in 1962 by joining the Everett Orioles, where he played with future major leaguers like Jim Lonborg, Wally Bunker, Tim Cullen, Ron Stong and Dan Frisella. In 1963, as a member of the Everett Orioles he pitched eight innings of no-hit baseball in the NBC World Series.

After a three year hiatus from the game, he returned to play for the Snohomish-Everett Royals from 1968 through 1972. The Royals disbanded following the 1972 season, he took up the cause to keep amateur baseball alive in the Everett area.  With the help from then Everett High School Athletic Director Jim Ennis, Pyatte convinced Bill Rucker (owner of H&L Sporting Goods) to sponsor his team and the H&L Twins were born in 1973 where he served as player/coach until the formation of the Everett Merchants.

An arm injury in 1978 ended Pyatte's pitching career but he continued to services as the team's designate hitter until 1991.Pyatte's playing career stretch through four decades.

Harold led the Merchants to NBC World Series Championship in 1988 and has twice been named the Pacific International League Coach Of The Year (2000 and 2001). He has coached more than 100 players who have gone onto play professional baseball including nine players who would go onto play in the major leagues.

In 2005, he was elected to the National Baseball Congress Hall of Fame.

Harold and his wife Sherry reside in Everett, they have been married for over 40 years.