After some 33 years in Civil Engineering, Dennis retired from the Texas Department of Transportation in 1996. Having been keenly interested in the Roswell Incident of 1947, Dennis decided to move to Roswell, New Mexico, to pursue his avocation: Ufology.

Initially Dennis worked as an Engineering Consultant in Roswell, volunteering his time at the International UFO Museum and Research Center on weekends. Nine months later he resigned from the engineering firm, assuming the duties of IUFOMRC Operations Manager, served on the Board of Directors and became the UFO Investigator for the Museum, as a full time volunteer.

Due to his love of ufology, his dedication and his exhaustive work, Dennis is regarded as a leading investigator and ufologist by his peers, communicating regularly with such well known researchers as Stanton Friedman, Donald R. Schmitt, Wendy Connors, and others in their quests to find the truth.

Currently, in that Dennis is no longer affiliated with the Museum, he is able to devote his full time as an independent researcher/investigator to the Roswell Incident, Area 51 and underground bases research, and frequently lectures on these and other topics, related to ufology.