Dennis O'Leary is an amateur astronomer with a lifelong interest in astronomy and space exploration. He is retired from a career with the New York State Court System. While living in New Jersey, he provided assistance to the staff of the Raritan Valley Community College Planetarium and was part of the Planetarium's outreach program. He also worked with Project Astro by providing astronomy related presentations to various schools throughout New Jersey. After moving to Pennsylvania, he became a member of the Chester County Astronomical Society and continues giving presentations as part of the Project Astro program at schools and various civic and community organizations.