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Descendants include Mary Robinson, President of Ireland from 1990 to 1997, and the United Nations High Commissioner for Human Rights, from 1997 to 2002, whose great-great grandfather was John Bourke of Heathfield, a brother of Charles.
In 2003, United Nations High Commissioner for Human Rights Sérgio Vieira de Mello invited Schwartz to join the Office of the United Nations High Commissioner for Human Rights.