Arlo does a little bit of everything, but what he really does is inspire courage. He has gone back and forth several times between management and in-the-trenches development on technically sophisticated products. He challenges every assumption he can find, and helps people learn to change – always and continuously. He has been involved in Agile since 1999. Yet he worked for 2 years in a rigorous, effective, and pro-people Waterfall development shop. He’s a strong believer in discipline and the agility that comes from it, in punctuated continuity, and in change as the only constant.