Steam & Plumbing Service Corp. was founded in 1924 by Robertson's grandfather, Arthur Zeitschel. Robertson has been actively involved in ASA over the years, serving as a trustee of the ASA Education Foundation, as chairman of the ASA PAC Board/Government Affairs Council and on the ASA Executive Committee. He served a term as president of WSA in 2006.
In 2007 he was chairman of ASA's Government Affairs Committee and also was on the ASA Education Foundation Board of Trustees.
Sharilyn Christiansen-Hoon of Buttes/Center State Pipe, Sacramento, CA, is the 2007-2008 WSA president. WSA, in partnership with the Pacific Southwest Distributors Association, operates as Region 1 of ASA, the Pacific Western Distributors Association, serving Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington and Wyoming.