Amundsen arrives in Buenos Aires, May 1912. The man immediately to his right is probably Don Pedro Christophersen. 
Having recently arrived in Buenos Aires after his lecture tour in Australia, Amundsen met Don Pedro Christophersen for the first time, and the Norwegian community in Buenos Aires gave a banquet for Amundsen and the crew of the Fram. Amundsen presented Christophersen with a large photograph of the mountain he had named after his patron, and made a speech.
He admitted, Hassel wrote of the speech, that "he was an unpleasant man to work with. He's right about that. At the same time, it is remarkable how a frank admission of a fault helps to appease the resentment it causes. Amundsen spoke well. All of it was apparently improvised." 
 Roald Amundsen Bildearkiv, Nasjonalbiblioteket.
 Sverre Hassel, diary, [31 May?, 1912], in Dagboksnotater fra Sydpolen, (Skien: Vågemots miniforlag, 1997), p.13.