Enrico Crema [aut, cre] (ORCID:
    <https://orcid.org/0000-0001-6727-5138>),
  Robert Di Napoli [ctb] (ORCID: <https://orcid.org/0000-0003-2180-2195>)

Benjamin R. Goldstein [aut, cre],
  Daniel Turek [aut],
  Lauren Ponisio [aut],
  Wei Zhang [ctb],
  Perry de Valpine [aut]

Daniel Turek [aut, cre],
  Perry de Valpine [aut],
  Christopher Paciorek [aut]

Ken Kellner [cre, aut],
  Perry de Valpine [aut],
  Christopher Paciorek [aut],
  Daniel Turek [aut]

David Pleydell [aut, cre, cph] (Package developer, <https://orcid.org/0000-0002-6450-1475>)

Richard Bischof [aut],
  Daniel Turek [aut, cre],
  Cyril Milleret [aut],
  Torbjørn Ergon [aut],
  Pierre Dupont [aut],
  Soumen Dey [aut],
  Wei Zhang [aut],
  Perry de Valpine [aut]

Nick Michaud [aut],
  Perry de Valpine [aut],
  Christopher Paciorek [aut, cre],
  Daniel Turek [aut],
  Benjamin R. Goldstein [ctb] (packaging contributions),
  Dao Nguyen [ctb] (contributions to the IF2 code),
  The Regents of the University of California [cph]

Aritra Halder [aut, cre],
  Sudipto Banerjee [aut]

Mark Myatt [aut] (ORCID: <https://orcid.org/0000-0003-1119-1474>),
  Ernest Guevarra [aut, cre] (ORCID:
    <https://orcid.org/0000-0002-4887-4415>)

Yikai Wang [Emory University], Xiao Wang [ICF]

original from National Institutes for Standards and Technology
        (NIST) http://www.itl.nist.gov/div898/strd/nls/nls_main.shtml R
        port by Douglas Bates <bates@stat.wisc.edu>

Troy D. Hill, Nathalie R. Sommer, Caroline R. Kanaskie, Emily A. Santos, and Autumn J. Oczkowski

Harald Schellander [aut, cre, cph],
  Michael Winkler [ctb, cph]

Mariana Menchero [aut, cre] (First author and maintainer),
  Nixtla [cph] (Copyright held by 'Nixtla')

Xianyan Chen <xychen@uga.edu>, Xiangrong Yin <yinxiangrong@uky.edu>

Willem Talloen [aut],
  Tobias Verbeke [aut],
  Laure Cougnaud [cre]

Michail Tsagris [aut, cre],
  Nikolaos Pandis [aut]

Maude Wagner [aut, cre] (ORCID:
    <https://orcid.org/0000-0002-1834-3218>),
  Ana W. Capuano [aut],
  Emmanuelle Comets [ctb]

José Pinheiro [aut] (S version),
  Douglas Bates [aut] (up to 2007),
  Saikat DebRoy [ctb] (up to 2002),
  Deepayan Sarkar [ctb] (up to 2005),
  EISPACK authors [ctb] (src/rs.f),
  Siem Heisterkamp [ctb] (Author fixed sigma),
  Bert Van Willigen [ctb] (Programmer fixed sigma),
  Johannes Ranke [ctb] (varConstProp()),
  R Core Team [aut, cre] (ROR: <https://ror.org/02zz1nj61>)