Gregerson Salvage over 70 years of expertise. Gregerson Salvage Incorporated (GSI) was founded in 1947 by LaVerne Gregerson. Dennis Gregerson took over the operation in 1984. Dennis had a passion for designing and building equipment which was a perfect match for the complex situations the company encountered. Collin Gregerson grew up in the company and in 1997 he became a full time employee. Dennis and Collin worked side by side until 2016 when Dennis lost his battle with cancer. Collin became the company president and continues Dennis and LaVerne's vision.