 Afterwards Galvanauskas led the Lithuanian delegation in Paris, that negotiated the Klaipėda Convention to determine the future of the Klaipėda Region.Between 1924 and 1927, Galvanauskas was accredited to the Court of St. James's in London and became Lithuania's ambassador to Great Britain.After the 1926 Lithuanian coup d'état he resigned from that post and returned to Klaipėda where he devoted himself mostly to teaching.