Prior to joining Sotheby’s International Realty, Kirk was the Vice Chairman of Stribling and the founding Director of Stribling Private Brokerage. He holds an economics degree from Stanford University and an MBA from Harvard Business School. He is the former President of Edward Lee Cave, Inc., and was at Stribling from 1995-2019, where he was in charge of Stribling's $5,000,000 and up luxury real estate brokerage division. His role included assisting Stribling's luxury brokers and their clients in formulating a global marketing plan and providing them with active support and knowledge of Manhattan's luxury market from Stribling's senior management.

Mr. Henckels personally researched and wrote the Stribling Private Brokerage Luxury Report and had been included every year in the New York Observer's list of the 100 Most Influential People in Manhattan Real Estate. He is also the recent national vice chairman of the Institute of Classical Architecture and co-author of the best-selling “Life at the Top” book on New York City’s top apartment buildings since 1880.

In addition, Mr. Henckels maintains his own private clientele which has included many of New York's most prominent families. These are individuals for whom discretion and professionalism are of utmost importance. As a former corporate banker, Mr. Henckels is well-versed in the business intricacies of negotiating and marketing distinctive properties.