I was surprised Gary Bernhardt wasn't on the list of notable speakers, so I scraped the names I could find and counted them. Here are the talk authors with 4 or more talks listed:

Rich Hickey: 15; David Nolen: 14; David Beazley: 10; Scott Meyers: 8; Douglas Crockford: 7; Brandon Rhodes: 7; Sandi Metz: 7; Chandler Carruth: 6; Rob Pike: 6; Simon Peyton Jones: 6; Edwin Brady: 6; Aaron Patterson: 6; Garrett Smith: 5; Zach Tellman: 5; Herb Sutter: 5; Kevlin Henney: 5; Evan Czaplicki: 5; Joe Armstrong: 5; Reginald Braithwaite: 5; Conal Elliott: 5; Gary Bernhardt: 5; Bodil Stokke: 4; Adrian Cockcroft: 4; Cliff Click: 4; Guy Steele: 4; Kyle Kingsbury: 4; Philip Wadler: 4;