Here is a fairly comprehensive list (in no particular order), thanks to Joseph Cruse Johnson, from his fantastic website “Famous Pipe Smokers”:
http://josephcrusejohnson.blogspot.com/2008_07_01_archive.html.
Albert Einstein, Mark Twain, William Faulkner, John Steinbeck, Norman Rockwell, Orson Wells, JRR Tolkein, Douglas MacArthur, Admiral Arleigh Burke, Stanley Baldwin, Neville Chamberlain, Bing Crosby, President Gerald Ford, Carl Sandburg, Harold Macmillan, Konrad Lorenz, Errol Flynn, Edgar Rice Burroughs, John D. MacDonald, Warner Baxter, Thomas Selfridge, Charles Nelson Reilly, Ossip Zadkine, , Max Frisch, , Paul Casals, Jack Lynch, Patrick Moore, Anthony Hulme, Ronald Colman, Alexander Kent, Jacques Brel, Lino Ventura, Alfred Wainwright, Rudolph Bultmann, Philippe Sollers, Jean Gabin, Leo Malet, G.E. Moore, Gilbert Ryle, Edmund Husserl, J.L. Austin, Lalo Schifrin, James Whitmore, Anthony Quayle, Ralph Richardson, Bernard Grebanier, Jean-Paul Sartre, Stanley Holloway, , Carl Jung, Paul Kruger, Curd Jurgens, Gerard Walschap, Trevor Howard, Tony Benn, Rod Hull, Trevor Baylis, Joss Ackland, Frank Muir, Manny Shinwell, Jack Hargreaves, Warren Mitchell, Rupert Davies, Russ Abbot, Van Gordon Sauter, Walter Cronkite, Robert Fulghum, Milorad Pavić, Glenn Ford, Erwin Shrodinger, Moustapha Akkad, Evelyn Waugh, Harold Wilson, Bertrand Russell, Alf Landon, Edgar Buchanan, Dean Jagger, Edward G. Robinson, Rudyard Kipling, Aaron Spelling, P.G. Wodehouse, Allen Dulles, Otto Klemperer, Henry Fonda, Lee Van Cleef, Jack Lemmon, Peter Cushing, Barry Fitzgerald, Hume Cronyn, Graham Chapman, Nigel Bruce, Bennet Cerf, Raymond Chandler, Alexander Graham Bell, Arthur Frank, Richard E. Byrd, Gregory Peck, Albert King, Clarence “Gatemouth” Brown, Edward Abbey, Juan Trippe, Frank Sinatra, General George S. Patton, Jacques Derrida, Hurbert Hoover, Sid James, Fred Trueman, Vincent Schiavelli, Eric Morecambe, Stephen Fry, Fred Thompson, Roscoe Dickinson, Guy N. Smith, Gunter Grass, Sean O’Casey, A.A. Milne, Sir Compton Mackenzie, Laurie Lee, W. Somerset Maugham, J.B. Priestly, Andre Dubus, Gordon Parks, F.A. Mitchell-Hedges, W.W. Denslow, William Conrad, William Gillette, Edwin Hubble, Rober Oppenheimer, Niels Bohr, Robert Young, Clark Gable, Fred MacMurray, Ralph Bellamy, Cary Grant, David Ogilvy, Sir Winston Churchill, Kind George VI, Arthur Miller, Ernest Hemingway, John Ford, Shelby Foote, Herschel Burke Gilbert, Thomas Johnston Taylor, Theodor Geisel (Dr. Seuss), Sir John Mills, Owen Barfield, Alan Christopher “Al” Deere, Elliot Harold Paul, Healey Willan, Harold Tucker Webster.
Collectively, I would argue, these men actually made the 20th Century, both literally and figuratively. To a man, all avid pipe smokes, each and every one. Moreover, many lived well beyond the average lifespan of their day, many passing in their mid- to late-eighties.