These photos were taken by the German photographer, Erich Salomon, whose work I came across through Iconic Photos. It’s incredible some of the events and people he managed to photograph; allegedly the term candid photography was first coined to describe his work. There is a whole series of posts about him here.
The picture above was taken from the 2nd Hague Reparation Conference, where several European leaders met to discuss how Germany was to pay back annuities required under the Treaty of Versailles. There are people who believe the debt and humiliation piled onto Germany by the Treaty of Versailles and in these subsequent meetings (particularly by France) drove German nationalism and helped contribute to the rise of the Nazi Party.
The other image is a reception in Berlin, where Albert Einstein and Max Plank ate with the British Prime Minister and a number of German business men and politicians.