DuPont de Nemours in Wilmington, Delaware which developed an improved process for the production of high-purity titanium dioxide for use as a paint pigment.

He worked closely for several years with a major Australian mining house, Peko-Wallsend, to develop a technology to produce a low-cost titanium process feedstock.

[4][5][6][7][8] Between 1975 and 1995 Dunn consulted to international corporations Reynolds Metals,[9] Kerr-McGee and DuPont, among others and performed R&D which formed the bases for several start-up ventures in South Dakota and beyond.

[11][12] From the late-1980s until the late-1990s Dunn joined with European and Asian interests to develop a process for low-cost titanium-based pigments, and worked in India for months at a time.

He was an adjunct faculty member in metallurgy at the South Dakota School of Mines and Technology, and was working on a patent application at the time of his death.