Douglas McGregor (1906–1964) American professor
Source: The Human Side of Enterprise (1960), p. 11 (2006; 13)
Source: The Anti-Post-Modern Post-Modernist http://errolmorris.com/content/lecture/theantipost.html
Douglas McGregor (1906–1964) American professor
Source: The Human Side of Enterprise (1960), p. 11 (2006; 13)
Dennis Gabor (1900–1979) Nobel Prize-winning physicist and inventor of holography
Source: Inventing the Future (1963), p. 161
George Katona (1901–1981) American psychologist
George Katona (1951). Psychological Analysis of Economic Behavior. McGraw-Hill, New York. p. 31
“The tendency to be rational is the consistent and hence predictable element in human behavior.”
David D. Friedman (1945) American economist, physicist, legal scholar, and libertarian theorist
Source: Price Theory: An Intermediate Text, 1986, p.4
Kurt Lewin (1890–1947) German-American psychologist
Source: 1930s, Principles of topological psychology, 1936, p. 11.
“It's tough to make predictions, especially about the future”
Yogi Berra (1925–2015) American baseball player, manager, coach
The earliest citations of this proverb, from the mid-twentieth century, refer to it as Danish in origin. See http://quoteinvestigator.com/2013/10/20/no-predict/
Disputed, Misattributed
“Prediction is very difficult, especially about the future.”
Niels Bohr (1885–1962) Danish physicist
As quoted in Teaching and Learning Elementary Social Studies (1970) by Arthur K. Ellis, p. 431
The above quote is also attributed to various humourists and the Danish poet Piet Hein: "det er svært at spå – især om fremtiden"
It is also attributed to Danish cartoonist Storm P (Robert Storm Petersen).
Disputed
Variant: It's hard to make predictions, especially about the future.
L. K. Samuels (1951) American writer
"The Real Science Behind Changing Climate", LewRockwell.com, August 1, 2014. https://www.lewrockwell.com/2014/08/lk-samuels/the-real-science-is-suppressed/