donjon shipbuilding & repair llc (dsr) is a united states shipyard located in lake erie port of erie, pennsylvania. the shipyard was founded by dirk vanenkevort in october 2005, when he took over the lease of the former litton industries property from the erie-western pennsylvania port authority for a price of $500,000 per year. in 2009, it was purchased by j. arnold witte, sr., the ceo/owner of donjon marine co., inc.