When he was 10, Krul's family moved from Friesland to Amsterdam where in 1615 he married Annetje Cristoffels and in 1623 he lived on the Bloemgracht. In that year he presented himself to church elders of the Dutch Reformed Church to be sent abroad as a "ziekentrooster" ("comforter of the sick"). On 25 January 1624 he sailed to New Netherland, where he arrived when Cornelius May just had become the first Director-General. In November 1624 he had returned to Amsterdam and made a report to the church elders, who gave him the right to perform baptisms and weddings in the new colony. He probably sailed back to New Amsterdam in May or June 1625, prior to the arrival of Peter Minuit the next year.