Dennis founded Lighthouse Imaging in 1984. He is an acknowledged industry expert in medical optics and has made major contributions to endoscope technology development. He is listed as an inventor or co-inventor on more than 20 patents and has published numerous papers in the areas of medical optics and optical instrumentation.
Dr. Leiner is a United States delegate to the International Standards Organization (ISO) overseeing worldwide endoscope standards. He is a Director at OEOSC, the technical arm of ANSI concerning optics. In addition, he is the Vice President of the Bioscience Association of Maine and Treasurer of the Maine International Trade Center.