MARK CLAY GROVE is an appraiser of personal property (antiques, art, silver, furniture, ceramics, textiles, etc) and a published author, lecturer, and former NYU adjunct faculty. Accredited (ASA) and Chartered (RICS) and a regular PBS TV personality. He has 34 years of experience in the field and the business of antiques and art. Certified USPAP compliant since 2002. D&B DUNS designation. Federal CCR Listed. Expert witness.