For example, in nineteen twenty-one, a Swiss doctor, Walter Morgenthaler published a book about the art of his patient, Adolf Wolfli.

VOA: special.2010.04.14

"Their network is mind-blowing, " says Mr. Howard, whose firm raised a venture round from Morgenthaler Ventures late last year.

WSJ: 'Super Angels' Fly In to Aid Start-Ups

Morgenthaler makes a good case that Siri represents the third revolution in human-computer interfaces that Jobs perfected and popularized.

FORBES: Apple's Siri: 'The Culmination Of Steve Jobs' Legacy'

Other returning investors include Felicis Ventures, Band of Angels, Ali and Hadi Partovi, Founders Fund, Morgenthaler Ventures, and SV Angel.

FORBES: Free Electronic Health Record Provider Practice Fusion Raises Total $64 Million