Khizr M. Khan's speech to the Democratic National Convention was written "in his head and mind."

What was to many the most moving moment of the Democratic National Convention did not come from a speechwriter. Though there were notes in the teleprompter, the speaker says they went unused...
http://www.slate.com/blogs/the_slatest/2016/07/30/khizr_m_khan_s_speech_to_the_democratic_national_convention_was_written.html