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From the company website: "Grandall and Engen LLC was formed late in 2013 through the merger of David Engen and Associates with David Grandall Organwerks. We bring together a number of technicians from both companies, with shop space in Minneapolis and a technical team in Rochester. David Engen acts as President and Chief Financial Officer while David Grandall acts as Vice President and Chief Operating Officer, although such roles in a small company are necessarily fluid. David Engen is largely responsible for tonal design and voicing while David Grandall deals with all physical design and engineering."