Dennis Nielsen Jr. is the President of Guardian Roof Coating, bringing over 35 years of experience in the roofing industry since starting his career in 1996. Originally from Brooklyn, New York, and now living in Windsor, Colorado, Dennis specializes in flat and low-slope roofing systems, with deep expertise in leak detection, repairs, waterproofing, roof restorations, and roof coatings for both residential and commercial properties, as well as single-ply roofing installations including TPO, PVC, and EPDM. Known for his sharp problem-solving skills, Dennis takes particular pride in diagnosing and fixing stubborn leaks that other roofers couldn’t crack, and he’s committed to giving every customer honest service, quality workmanship, and dependable support whenever they need it. Outside of work, Dennis is deeply involved in girls’ fastpitch softball as a coach, trainer, and umpire, enjoys giving back through causes supporting battered women and children facing illness or abuse, and cherishes time spent traveling and with family — all while cheering on the Mets, Knicks, Rangers, and Patriots.