Following completion of his neurosurgical training in 1986 at Sydney’s Royal Prince Alfred Hospital and the Royal Alexandra Hospital for Children, Morgan undertook a Fellowship in Neurosurgery at the Mayo Clinic in Rochester, Minnesota, under the mentorship of Thoralf M. Sundt.
Together with his cousin Morten Sig. Bergesen, in 1976 he took over the leadership of the company Bergesen d.y. after his grandfather Sigval Bergesen the Younger retired for health reasons.