Heritage has promoted Aviva Lehmann.

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She joined Heritage in 2013 as director of American art and the Dallas auction house said she is known as a “power broker in American art”. Before joining Heritage, Lehmann served as vice president and specialist in the American art department at Christie’s.

She is also an adjunct professor of appraisals and valuation in the art administration master’s programme at New York University and will continue to lecture on American art at museums and institutions.

Johnson joins Hindman

US firm Hindman Auctions has appointed Sean Johnson as senior specialist for the watch department. Johnson brings over a decade of experience working at the intersection of pre-owned marketplaces and the watch industry.

Prior to joining Hindman, he was an international brand strategist at Billstone. Johnson previously served as an ecommerce specialist for jewellery and watches at Sotheby’s.