Bill Maxwell, founder of Diamond M Drilling Inc, started out in the oil fields in 1978 as a roughneck. In 1980 he moved into the water well drilling industry learning under a seasoned water well contractor. Bill started his first business, Maxwell Pump & Supply in 1985 installing and repairing pump systems. He added his first drill rig to the business in 1988. Diamond M Drilling Inc was started in 1999 based out of Bozeman with his eldest son Donnie. In 2012 Diamond M Drilling Inc branched out into North Dakota and today Donnie is running Diamond M Drilling Inc Montana and Bill is running Diamond M Drilling Inc North Dakota.