These are some books written by members of the meetup.
David Robinson
JJ Allaire
Rob Hyndman
Wes McKinney
Max Kuhn & Kjell Johnson
Q. Ethan McCallum
Andrew Gelman
Richard Cotton
Cathy O'Neil & Rachel Schutt
Tony Fischetti
John Myles White
Hadley Wickham
Mike Dewar
Max Kuhn
Daniel Y. Chen
Drew Conway & John Myles White
Paul Dix
Jeroen Janssens
Andrew Gelman & Deborah Nolan
Chris Fregly & Antje Barth
Bryan Lewis and Michael Kane
Harlan Harris, Sean Patrick Murphy & Marck Vaisman
Julia Silge & David Robinson
Jared P. Lander
Andrew Gelman & Jeronimo Cortina
Andrew Gelman & Jennifer Hill
Hadley Wichkam
JD Long
Andrew Gelman, John B. Carlin, Hal S. Stern, David B. Dunson, Aki Vehtari & Donald B. Rubin