In one such essay, archived in 2003, Stephenson summarizes his communication policy as follows: Persons who wish to interfere with my concentration are politely requested not to do so, and warned that I don’t answer e-mail… lest [my communication policy’s] key message get lost in the verbiage, I will put it here succinctly: All of my time and attention are spoken for—several times over. Please do not ask for them.

— Deep Work by Cal Newport