William S. Hammack

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Bill Hammack explaining the difference between Betamax and VHS recorders
Video of Bill Hammack explaining how a film projector works

William (Bill) S. Hammack (born 1961) is an American chemical engineer, and Professor in the Department of Chemical Engineering at the University of Illinois at Urbana–Champaign.[1]

Hammack is well-known for his ventures in science communication as the persona Engineer Guy: between 1999 and 2005 he produced radio commentaries for Illinois Public Media, and starting in 2010, he produced a regular series of videos on YouTube explaining the engineering of everyday objects.[2] He's also one of the authors of the book Eight Amazing Engineering Stories.[2][3]


In 2002, Hammack was awarded the Edwin F. Church Medal.[4] In 2019, he was awarded with the Carl Sagan Award for Public Appreciation of Science.[5]


  1. ^ "William S. Hammack". Chemical and Biomolecular Engineering. University of Illinois at Urbana–Champaign.
  2. ^ a b Ragan, Sean Michael (July 10, 2012). "Text Tool: Eight Amazing Engineering Stories". Make.
  3. ^ Hammack, Bill; Ryan, Patrick; Ziech, Nick (April 7, 2012). Eight Amazing Engineering Stories: Using the Elements to Create Extraordinary Technologies. Articulate Noise Books. ISBN 978-0-9839661-3-5.
  4. ^ "Edwin F. Church Medal". American Society of Mechanical Engineers.
  5. ^ https://chbe.illinois.edu/professor-bill-hammack-receives-carl-sagan-award-for-the-public-appreciation-of-science/

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