Green worked as a chainman,
surveying for the
Seattle, Lake Shore and Eastern Railway, then on the sternwheeler
Henry Bailey, a Puget Sound Mosquito Fleet vessel that also went up the
Skagit River. . According to Green, "this was a faithful little boat". Green's innovative business practices soon allowed him to become a fleet owner, president of what was named the
La Conner Trading and Transportation Company, He established Seattle's dominance of the Mosquito Fleet, relative to
Olympia or
Tacoma, which Speidel considers to be a key factor in Seattle's emerging and continued dominance of the Puget Sound region. In 1925, Green purchased the distressed Peoples Savings Bank for
US$200,000, and in 1927, With
branch banking not allowed at the time, he began or acquired several other banks as wholly owned subsidiaries. In 1949, when he passed the presidency of the bank to his son Joshua Jr., deposits stood at $128 million. By 1969, when Joshua Green turned 100, deposits had reached $400 million. In 1988, the bank was purchased by
U.S. Bancorp and renamed U.S. Bank of Washington. ==Personal life and death==