Conley–Zehnder theorem, a mathematical theorem named after Charles C. Conley and Eduard Zehnder
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Egon Zehnder, a global executive search firm based in Switzerland
In 1927, William Zehnder, Sr. purchased the hotel remodeling the building, including redesigning the front of the building to look like Mount Vernon.
Zehnder's Holz Brucke (German for wooden bridge) looks as though it could have been plucked up from the Black Forest or a river valley in Switzerland and planted astride the Cass River in the middle of town.