Philipp K. Janert is the author of "Data Analysis with Open Source Tools" (O'Reilly, 2010) and "Feedback Control for Computer Systems" (O'Reilly, 2013) as well as "Gnuplot in Action" (first and second edition, Manning, 2009 and 2015). He has worked as a programmer and scientist, in small startups and large corporations. He holds a Ph.D. in theoretical physics.
