Resignations from Sept to Dec in chronological order:    
 
Equifax CEO Richard Smith                       Sep. 26, 2017    
 
Dentsply Sirona Inc CEO Jeffrey T. Slovin       Oct. 2, 2017    
Greater Naples CEO Paul Thein                   Oct. 4, 2017    
Pepsico CEO D Shivakumar                        Oct. 9, 2017    
Samsung CEO Kwon Oh-hyun                        Oct. 12, 2017    
Oman Air CEO Paul Gregorowitsch                 Oct. 16, 2017    
ASCENDAS Funds Management CEO Chia Nam Toon     Oct. 20, 2017    
Hudson's Bay CEO Gerald Storch                  Oct. 20, 2017    
Red Cross Texas Gulf Coast Region CEO David Brady   Oct. 28, 2017    
BuildDirect CEO Jeff Booth                      Oct. 29, 2017    
Podesta Group founder Tony Podesta              Oct. 30, 2017    
Menninger Clinic CEO Dr. C. Edward Coffey       Oct. 31, 2017    
 
Renaissance Technologies CEO Robert Mercer      Nov. 2, 2017    
Ardent Leisure CEO Simon Kelly                  Nov. 7, 2017    
El Al CEO David Maimon                          Nov. 8, 2017    
Altice CEO Michel Combes                        Nov. 9, 2017    
Public Protector Busisiwe Mkhwebane CEO Themba Dlamini  Nov. 14, 2017    
James Cancer Hospital CEO Michael Caligiuri     Nov. 16, 2017    
PR Electric Power Authority CEO Ricardo L. Ramos        Nov. 17, 2017    
Ellies CEO Wayne Samson                         Nov. 21, 2017    
Hewlett Packard CEO Meg Whitman                 Nov. 22, 2017    
Oi SA CEO Marco Schroeder                       Nov. 24, 2017    
Tumblr CEO David Karp                           Nov. 27, 2017    
London Stock Exchange CEO Xavier Rolet          Nov. 28, 2017    
Bruce Telecom CEO Bart Cameron                  Nov. 29, 2017    
TravelCenters of America LLC CEO Thomas O'Brien Nov. 30, 2017    
Tricentennial Commission CEO Edward Benavides   Nov. 30, 2017    
 
City Light CEO Larry Weis                       Dec. 4, 2017    
Steinhoff's R100bn CEO Markus Jooste            Dec. 5, 2017    
Uchumi Supermarkets CEO Julius Kipng'etich      Dec. 6, 2017    
Chicago Public Schools CEO Forrest Claypool     Dec. 8, 2017    
Deutsche Boerse CEO Carsten Kengeter            Dec. 8, 2017    
Nation Media Group CEO Joe Muganda              Dec. 11, 2017    
Cheil Worldwide CEO Daiki Lim                   Dec. 11, 2017    
Fenway Health CEO  Dr. Stephen L. Boswell       Dec. 11, 2017    
Diebold/Nixdorf CEO Andy Mattes                 Dec. 14, 2017    
Diebold/Nixdorf CEO Andy Mattes                 Dec. 14, 2017    
AT&T CEO Randall Stephenson                     Dec. 15, 2017    
Vast Resources CEO Roy Pitchford                Dec. 18, 2017    
Spackman Entertainment Group CEO Charles Spackman   Dec. 18, 2017    
ESPN President John Skipper                     Dec. 18, 2017    
Innogy CEO Peter Terium                         Dec. 20, 2017    
Papa John CEO John Schnatter                    Dec. 22, 2017    
NYPD Police Chief Carlos Gomez retires          Dec. 22, 2017    
    Alphabet Executive Chairman Eric Schmidt        Dec. 22, 2017
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