William O'Reilly, AAA Certified

USPAP compliant through:



Impressionist & Modern Art

Member Type

Certified Member


Charitable Donation; Estate Tax Liability; Equitable Distribution; Insurance

Appraiser's Statement

William O’Reilly has been active in the international art market for more than 25 years, as a specialist, auctioneer, dealer, adviser and appraiser. In that time he has gained extensive experience assisting clients at the highest level with the appraisal, acquisition, sale and donation of paintings, sculpture and works on paper from the Renaissance to today. William founded Argonaut Fine Art Ltd. in New York in 2022 to provide a full range of independent appraisal services as well offering advice on the art market for both buyers and sellers, with an emphasis on Impressionist and Modern Art.