Longtime Christie’s executive Andreas Rumbler, the chairman of Christie’s Switzerland and an occasional auctioneer for the house, is leaving his employer of nearly three decades to join the boutique powerhouse dealership Lévy Gorvy.

Rumbler is the latest in a long line of top dealmakers who have left auction houses behind in recent years to work at galleries or as private art advisors. Brett Gorvy himself left Christie’s after nearly a quarter century to establish Lévy Gorvy with veteran dealer Dominque Lévy in 2016.

Rumbler will officially join the gallery in November as a partner. He will lead a new special office in Zürich called Lévy Gorvy and Rumbler, also due to open in November. The Zürich office will focus on providing art advisory services to clients in Switzerland, Germany, and across Northern Europe.

In a statement, Lévy Gorvy said the new Zürich office will deepen the gallery’s ability to provide specialized “bespoke private advisory services to collectors and institutions.” Last year, the gallery also opened an office in Shanghai, China.

Rumbler has deep roots in Zürich and the surrounding region: He was named chairman of Christie’s Switzerland in 2010 and led the auction house’s German operations from 2000 to 2010. He also served as deputy chairman of the Impressionist and Modern art department and oversaw sales from the estate of the legendary Swiss dealer and collector Ernst Beyeler.

In a statement, Rumbler said he is looking forward to creating “a new enterprise focused on connoisseurship and the art of collecting.”

“The formation of this partnership in Zürich reflects our commitment to Europe, and our collector-centric approach,” Dominique Lévy said. The new office is intended “to give our existing clients and new relationships access to an art advisory service that provides peerless personal service and assistance in their own region.”