Question: Ocean's Kingdom is a ballet choreographed by a Danish Danseur who since 1990 has bore what?
Sentence (from "Peter Martins"): He was a principal dancer with the Royal Danish Ballet and with the New York City Ballet (NYCB), where he joined George Balanchine, Jerome Robbins and John Taras as balletmaster in 1981, retired from dancing in 1983 at which time he became Co-Ballet Master-In-Chief with Robbins, and since 1990 has borne sole responsibility for artistic leadership of City Ballet.
Relevant evidence: Yes