Voss used to handle hostage negotiations for the FBI and has since founded Black Swan, a business advisory firm that specializes in negotiations.

沃斯曾经为联邦调查局（FBI）设计过人质谈判策略，后来创建了以谈判策略见长的商业咨询机构黑天鹅公司（Black Swan）。

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In early 1973, Black September took the American ambassador and his deputy (along with one Belgian diplomat) hostage in Sudan's capital, Khartoum, and, after President Nixon refused to negotiate, murdered them.

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On the morning of September 5, 1972, eight members of the Palestinian group Black September broke into the Israeli team's apartments in the Olympic Village and took the 11 Israeli athletes hostage, killing two immediately.

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