He met a musician called Robert Craft who came to live with the family and helped Stravinsky sort out his compositions and papers.

Edited and with commentaries by Robert Craft.

Stravinsky stated in a conversation with Robert Craft that the third movement was meant to be placed after the first movement.

Igor Stravinsky and Robert Craft meet for the first time.

As Robert Craft, the composer's closest associate, has observed, he was a dandy, forever reinventing himself.

Although he made an appearance, the actual performance was conducted by Robert Craft.

See also another response and the original media review by Robert Craft.

Robert Craft, Stravinsky's musical assistant, at this point pressed his mentor.

Robert Craft also conducted the first staged performance, in Hamburg on 30 April 1963.

As such, part of the motivation behind its composition has been cited by Robert Craft and others as the product of a spiritual necessity.