Qualifications: New York State License #16000005339, ASHI Certified Inspector, New York State DEC WDI Inspector #C9820385 About: Doug Manzella has been inspecting homes since 1988 and has performed over 10,000 inspections. Certifications: ASHI Certified Inspector #12044 (1993), NY State DEC WDI Inspector (2002), NRPP Certified Radon Measurement Specialist #100531RT