Black Swan Group is a negotiation training and advisory firm that specializes in teaching negotiation tactics based on the field-tested methodologies of former FBI lead international kidnapping negotiator, Chris Voss. Their services are geared towards improving the negotiation skills of professionals across various industries, including sales, leadership, and procurement. The Black Swan Group offers a range of resources, such as books, training sessions, webinars, and consulting services, all designed to help clients achieve better outcomes in both personal and professional negotiations. Their website, https://blackswanltd.com/, provides access to these resources, detailed information about their methodologies, and opportunities for clients to engage with their services to enhance their negotiation capabilities.