The survey package has benefited from code, bug reports, and feature 
requests from users, including:
  Daniel Almirall
  Guiseppe Antonaci
  Norman Breslow
  Arthur Burke
  Ron Burns
  Stefano Calza
  Shelby Chartkoff
  Anthony Damico
  Wade Davis
  Michael Donohue
  Melanie Edwards
  Ben French
  Jacques Ferrez
  Daniella Gollinelli
  Alistair Gray
  James Greiner
  Lucia Hindorff
  Stas Kolenikov
  Scott Kostyshak
  Lisa McShane
  Ana Patricia Martins
  Tapan Mehta
  Daryl Morris
  Djalma Pessoa
  Ana Quiterio
  Gillian Raab
  Christian Raschke
  Brian Ripley
  Fred Rohde
  Steve Roberts
  Andrew Robinson
  Lee Sieswerda
  Phil Smith
  Corey Sparks
  Takahiro Tsuchiya
  Richard Valliant
  Tobias Verbeke
  Renzo Vettori
  Diego Zardetto
  Alan Zaslavksy
and from dicussions with Chris Wild and Alastair Scott. 

Some work on the package has been funded by Fondation Leducq through a
grant to the LINAT collaboration and by the Marsden Fund through a
grant to the University of Auckland.

Patrick Aboyoun did the S-PLUS port of version 3.6-8

The svyolr() code is largely ripped from the MASS package of Venables & Ripley, and
parts of the code for svycoxph() are modified from Therneau's survival package.

