Machlup recruited William Hutt into the 1949 Seelisberg meeting.

Evidence

Interestingly, Hayek proposed inviting Hutt as a replacement for Machlup, who was unable to attend the meeting in 1949 (Hayek to Dennison, February 10, 1949, FAH, 73.10). This proposal came from Machlup, who persuaded Hayek to include Hutt in the Seelisberg meeting (Hayek to Machlup, January 26, 1949, Fritz Machlup Papers (hereafter FMP), Hoover Institution Archives, 36. — Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, 994