The authors of the dependency Rust crates:

extendr-api (version 0.3.1):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Hiroaki Yutani
  Ilia A. Kosenkov

extendr-engine (version 0.3.1):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Hiroaki Yutani
  Ilia A. Kosenkov

extendr-macros (version 0.3.1):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Hiroaki Yutani
  Ilia A. Kosenkov

lazy_static (version 1.4.0):
  Marvin Löbel

libR-sys (version 0.3.0):
  andy-thomason
  Thomas Down
  Mossa Merhi Reimert
  Claus O. Wilke
  Ilia Kosenkov
  Hiroaki Yutani

paste (version 1.0.7):
  David Tolnay

proc-macro2 (version 1.0.40):
  David Tolnay
  Alex Crichton

quote (version 1.0.20):
  David Tolnay

syn (version 1.0.98):
  David Tolnay

unicode-ident (version 1.0.1):
  David Tolnay

winapi-i686-pc-windows-gnu (version 0.4.0):
  Peter Atashian

winapi-x86_64-pc-windows-gnu (version 0.4.0):
  Peter Atashian

winapi (version 0.3.9):
  Peter Atashian