Here the long list of people who have contributed pieces of code to ROOT since the project started in 1995. The project would not be what it is today without them.

Roel Aaij

  • contribution to GUI classes
Mohammad Al-Turany
  • QTGSI classes
Eric Anciant
  • TQuaternion class
Aberto Annovi
  • speed-up of TH1::FillRandom when source & destination have identical parameters
Ilka Antcheva
  • editor of the User's Guide, quality assurance
  • many contributions to the high level GUIs
Silvia Arcelli
  • Contribution to THnSparse
Khamit Ardashev
  • Improvements in h2root/hntvar2 to support small integers as shorts
Elias Athanasopoulos
  • Ruby interpreter interface
Alejandro Alvarez Ayllon
  • TSSLSocket class and integration in TWebFile
Maarten Ballintijn
  • initial linux port
  • PROOF development
Paul Balm
  • implemented TDatabasePDG::ConvertGeant3ToPDG
Daniel Barna
  • CINT install target
Jean-Francois Bastien
  • contribution to Reflex
Peter D Barnes
  • contribution to the matrix classes
Guy Barrand
  • contribution to GUI classes
Bertrand Bellenot
  • port of ROOT GUI to Win32 using Win32 version of GDK/GLIB
Zev Benjamin
  • TPacketizerProgressive class for PROOF
Denis Bertini
  • changes needed so TCanvas can be embedded in Qt GUI, memory leak checker
Dario Berzano
  • Dataset stager daemon and other PROOF related contributions
Adrian Bevan
  • class TFeldmanCousins
  • TMath::BubbleHigh, TMath::BubbleLow
Marek Biskup
  • PROOF contributions
Brian Bockelman
  • THDFSFile for accessing the Hadoop file system
  • Improvement to ROOT I/O disk and memory efficiency.
Sebastian Boeser
  • class TGraphPolar
Dennis Box
  • TPgSQLStatement implementation
Dan Bradley
  • Chirp plugin which allows remote file access via the Condor Chirp protocol
Gerhard Brandt
  • class THtml, generation of the clickable class hierarchy
Thomas Bretz
  • Additions to TF1: functions IntegralFast and CalcGaussLegendreSamplingPoints
  • Improvements in TRolke
Nicolas Brun
  • classes TFormula, TText, TLatex
Rene Brun
  • ROOT conception
  • all parts of the system
Ernst-Jan Buis
  • contour drawing options "AITOFF","MERCATOR","SINUSOIDAL","PARABOLIC"
Nenad Buncic
  • HTML documentation generator, 3D shapes and geometry classes,
  • interface to X3D
Toby Burnett
  • Support for indirect files in hadd utility
Damir Buskulic
  • LinuxPPC support, contribution to the User's Guide
  • customizable context menus
Philippe Canal
  • interface from ROOT/CINT to native compiler, FNAL support coordinator
  • support and development of TTreeFormula and TTree query mechanism
Federico Carminati
  • updates in PDG codes and eventgenerator interface classes
  • TSpline classes
  • Support for gcc option -weffc++
Evgeni Chernyaev
  • Paint3DAlgorithms used by the LEGO and SURF options
Gian Paolo Ciceri
  • PostgreSQL interface
Jan Conrad
  • class TRolke and tutorial Rolke.C
Olivier Couet
  • implement support for CellArrays in TPostScript
  • SVG driver
  • graphics support, development of 3-d interface
Ben Cowan
  • port to MacOS X
Kyle Cranmer
  • contribution in RooStats
Bianca-Cristina Cristescu
  • contributions to ROOT6 / meta
David Dagenhart
  • Support for LZMA compression in ROOT files
Bastien Dallapiazza
  • TSpider, TParallelCoord classes
Christophe Delaere
  • TLimit TLimitDataSource TConfidenceLevel and TMultiLayerPerceptron classes
Matthieu Demaret
  • class TGraphPolar
Jason Detwiler
  • Implementation of class KelvinFunctions
  • Implementation of multiple columns in TLegend class
  • Implementation of TClonesArray::MultiSort
  • TTree support for csv files
Adrien Devresse
  • libRDAVIX, the davix client code
Mat Dobbs
  • TLegend class
Alvise Dorigo
  • libNetx, the xrootd client code
Pierre-Luc Drouin
  • extensions of TFormula and bug fixes
Jean-Damien Durand
  • CASTOR interface code in the TCastorFile class
Anders Eie
  • TTreeReader
Rutger v.d. Eijk
  • various contributions to GUI classes
Giulio Eulisse
  • class TQtLock
Denis Favre-Miville
  • contribution to the GUI and graphics editors
André Felipe
  • CINT contributions
Jan Fiete Grosse-Oetringhaus
  • several contributions to PROOF testing and class TGridJDL
Valerio Filippini
  • contribution of TGenPhaseSpace class
Kirill Filimonov
  • modified Struve functions in TMath
Frank Filthaut
  • contribution of TFractionFitter class
Valery Fine
  • Win95/NT port, OpenGL interface
Lucie Flekova
  • several improvements of the GUI Builder
Leandro Franco
  • xrootd multi-buffer support, prefetching, read-ahead
Markus Frank
  • STL I/O and TBranchElement splitting
  • Implementation of TRefProxy
John Frankland
  • TString contributions
Oliver Freyermuth
  • SQLite plugin
Keisuke Fujii
  • port to MacOS X
Fabrizio Furano
  • libNetx, the xrootd client code
  • libRDAVIX, the davix client code
Nikolai Gagunashvili
  • Reimplementation of TH1::Chi2Test
Gerardo Ganis
  • all matters related to client/server authentication
  • PROOF developments
Davide Gerbaudo
  • VIOLIN drawing option for 2D histograms.
Nerses Gevorgyan
  • support for exporting Neural Nets into Fortran code
Andrei Gheata
  • main developer of the ROOT geometry classes
Mihaela Gheata
  • many contributions to the geometry package
  • extension of g2root, author of stressgeom
Mary-Louise Gill
  • editline terminal interface
Thorsten Glebe
  • Original author of the Smatrix package
Piotr Golonka
  • class TMCParticle
Masaharu Goto
  • CINT C/C++ interpreter
Roberto Gracia Del Baño
  • Event Recorder
Oleksandr Grebenyuk
  • Major developments in TLatex and TPostScript text.
  • OpenLDAP interface
Kristjan Gulbrandsen
  • monitoring facility for PROOF
  • Clarens and PEAC interfaces for PROOF
Christian Gumpert
  • class TEfficiency and new TGraphAsymmErrors::Divide
Andrew Haas
  • add support for asymmetric errors in the GraphFitChisquare functions
  • implement TGraphAsymmErrors::BayesDivide and corresponding functions
Daniel Haertl
  • Reimplement in C++ the original chi2test of Nikolai Gagunashvili
Andy Hanushevsky
  • the eXtended ROOT daemon (xrootd)
Robert Hatcher
  • class TXTRU and tutorials xtruDraw.C and xtruSamples.C
  • class TTimeStamp
Bill Heintzelman
  • TTree::AutoFlush,Autosave improvements
Miroslav Helbich
  • apply method in the TGraph classes
Marc Hemberger
  • contributions to the thread classes, SapDB interface
Fabio Hernandez
  • TS3WebFile with improved Amazon S3 and Huawei support
  • Extend TS3WebFile to also support Google Storage
Andreas Hoecker
  • author of the TMVA package
Carsten Hof
  • Implementation of classes TGraphEditor, TH1Editor and TH2Editor
Ivana Hrivnacova
  • VirtualMC design and implementation + corresponding web pages
Jacek M. Holeczek
  • dynamic linker interface for IBM/AIX, contributions to MakeTree code
  • generator, many comments on the Users Guide, HowtoMC
Christian Holm Christensen
  • contributions to the build system (configure,,
  • implementation of the principal component analysis class TPrincipal
  • debian and redhat packaging scripts, port to GNU/Hurd (Debian)
Marian Ivanov
  • memory leak checker
Jan Iwaszkiewicz
  • PROOF dataset upload mechanism
Stanislaw Jadach
  • the FOAM classes
Lukasz Janyst
  • split vector<T*> and schema evolution
  • new xrootd client plugin TNetXNGFile
Chris Jones
  • Optimizations of the write portion of TStreamerInfo and TBranchElement.
Luke Jones
  • class TGraphDelaunay
Pierre Juillot
  • various contributions to the postscript driver
Michal Kapalka
  • improvements in the ZIP package
Susan Kasahara
  • many contributions to the debuging phase of the I/O system
Guenter Kickinger
  • PROOF contributions
Stephan Kluth
  • changes in rootcint to handle templates
Anna Kreshuk
  • contrinutions to TMath, TH1::Chi2Test, TFitter::GraphFitChisquare
Daniele Francesco Kruse
  • contribution to the GDML interface
Dmytro Kustov
  • OpenBSD port
Christian Lacunza
  • TTabCom [TAB] command line expansion class, #1 bug reporter
Yue Shi Lai
  • TMathText class
Alfio Lazzaro
  • Integrating Minuit2 in Roofit and adding support for MPI
Wim Lavrijsen
  • PyRoot package
Kerry Lee
  • Contribution to TDatime::Set
Josef Leydold
  • UNURAN package and interfaces
Bruno Lenzi
  • TEntryListArray
Sergey Linev
  • XML interface package
  • SQL interface extensions, ODBC driver
Yan Liu
  • TOracleResult
Joa Ljungvall
  • original author of TGTextViewStream
Jose Lo
  • SAX and DOM XML parser interfaces
Anna-Pia Lohfink
  • Guide lines in Editor, Opacity, Gradient
Constantin Loizides
  • PROOF testing and debugging
Johan Lundberg
  • Additions to the TRolke class
Elaine Lyons
  • First versions of the Users Guide
Henry Maddocks Anar Manafov
  • STL compatible iterators for ROOT collections
  • gLite plugin, PROOF development
David Gonzalez Maline
  • contribution to GUI classes
Diego Marcos Segura
  • Fundamental CINT call wrapper improvements
John Marraffino
  • improvements in TUnixSystem::StackTrace()
Mike Marino
  • script to run a CSV file with python in tutorials/pyroot
Claudi Martinez
  • provided the fitsio module
Andy Mastbaum
  • implementation of TH1::Interpolate and TH2::Interpolate
Jiri Masik
  • Numerous contributions to the system
  • has submitted many suggestions and ideas. Found and fixed many bugs
  • pioneer on many fronts, installation, support
Pere Mato
  • PyRoot package
  • cmake build system
Richard Maunder
  • OpenGL developments
Grzegorz Mazur
  • class TDCacheFile, interface to DESY's dCache system
Marco Meoni
  • PROOF CPU quota, CAF and AliEn contributions
Ramon Medrano Llamas
  • PROOF worker autodiscovery via Bonjour
Akiya Miyamoto
  • port to IBM AIX with xlC v5.x
Tgiran Mkrtchyan
  • class TDCacheFile, interface to DESY's dCache system
  • libRDAVIX, the davix client code
Lorenzo Moneta
  • Math libraries
Miroslav Morhac
  • TSpectrum classes
Dave Morrison
  • library load path fixes, some Makefile updates
Andreas Morsch
  • many contributions to the Virtual Monte Carlo
Alja Mrak-Tadel
  • Several contributions to GUI and GL
Johannes Muelmenstaedt
  • kerberos5 authentication module
Pasha Murat
  • Lorentz vector classes, PDG interface
Axel Naumann
  • THtml improvements (namespace, header/footer)
  • many suggestions for Trees
  • CINT/Reflex integration
  • cling co-author, cling integration
Stanislav Nesterov
  • TFumili class
Anne-Sylvie Nicollerat
  • improvements in tutorial hadd.C to take into account Trees
Maxim Nikulin
  • improvements in the TGraph suite memory management functions
Paul Nilsson
  • PROOF contributions (TProofResources classes)
Marcin Nowak
  • Extend TTreeIndex and TTreeFormula to suport 64bit integer.
John Odonnell
  • contributed to TFormula the support for recursive functions definitions
Eddy Offermann
  • contributed to the TGraph Paint functions
  • contributed to the TMatrix classes (InvertPosDef)
Valeriy Onuchin
  • port of ROOT GUI to Win32 using Win32 version of GDK/GLIB
  • various contributions to GUI classes (scrolled text in TGTextEntry)
  • implementation of Qt like signals and slots mechanism (TQObject,
  • TQConnection, etc.)
  • author of Carrot (
Katerina Opocenska
  • author of the Event Recorder
Juan Palacios
  • Contribution to symmetric representation of SMatrix classes
Suzanne Panacek
  • editor of the User's Guide
Iulia Pasov
  • prototyping JavaScript graphics with d3.js
Marc Paterno
  • implement utility functions used by TGraphAsymmErrors::BayesDivide
Victor Perevoztchikov
  • optimized hash function, filename expander
  • testing and comments of the Automatic Schema Evolution system
Andreas Peters
  • TGrid extension and TAlien plugin
  • TMonaLisa monitoring plugin
Danilo Piparo
  • contribution in RooStats and Math
  • Dictionaries and integration with experiments' frameworks
Filip Pizlo
  • TBits extension and test program testbits.cxx
Muriel Pivk
  • class TSPlot
Timur Pocheptsov
  • OpenGL viewer, gl-pad, ROOT browser for iOS, graphics back-end for OS X.
Witold Pokorski
  • contributed to the GDML interface
Art Poskanzer
  • contributed to styles Bold, Video, Pub
Miha Puc
  • contributed to TMath::Voigt
Gilles Quemener
  • contributed to TMultiDimFit::EvalError function
Bartolomeu Rabacal
  • Math libraries: GoFTest and TKDE classes
Fons Rademakers
  • ROOT conception
  • all parts of the system
Nathalie Rauschmayr
  • port to x32 psABI and its validation
Sven Ravndal
  • initial event generator interface
Reiner Rohlfs
  • various contributions to GUI classes
Stefan Roiser
  • Reflex and Cintex
Paul Russo
  • Improvements in I/O
Sangsu Ryu
  • PROOF contributions
Justin Salmon
  • new xrootd client plugin TNetXNGFile
Pawel Sawicki
  • the FOAM classes
Otto Schaile
  • various contributions to GUI classes
Heiko Scheit
  • improvements in TTreePlayer::DrawSelect()
Manuel Schiller
  • contribution on the Cholesly decomposition in SMatrix
  • contributions in RooFit
Gregory Schott
  • contributions in RooStats
Jason Seely
  • contribution to TH1::GetAsymmetry()
Daniel Sigg
  • TGNumberEntry GUI widget
Evgenia Smirnova
  • OpenLDAP interface
Stefan Schmitt
  • contribution to TUnfold class
Elvin Alin Sindrilaru
  • Asynchronous prefetching of TTree baskets
Tomasz Sosnicki
  • contribution to gviz3d/TStructViewer
Marcelo Sousa
  • Amazon S3 and Google Storage I/O plugins
Peter Speckmayer
  • author of the TMVA package
Abdelhalim Ssadik
  • contribution to GUI classes (TGDockableFrame)
Toby St. Clere Smithe
  • cppyy pythonizations API
Joerg Stelzer
  • author of the TMVA package
Matthew Strait
  • Documentation improvements
Christian Stratowa
  • development of class TGraphSmooth + many suggestions
Matevz Tadel
  • Several contributions to the 3-d graphics and GL interface
Jan Therhaag
  • author of the TMVA package
Tim Tran
  • Full implementation of all projections in THistPainter::ShowProjection3
Long Tran-Thanh
  • PROOF contributions
Alexandre V. Vaniachine
  • byteswapping assembler code for the i486 and up
Gene Van Buren
  • TF1, TF2, TF3 Moment functions
Marco van Leeuwen
  • THistPainter improvements: support for log scales with CONT options
Peter van Gemmeren
  • Support for multiple cached TTree in a single TFile
Wouter Verkerke
  • Author of the RooFit package
Brett Viren
  • contributed the GUI TGTableLayout manager and the Viewer example program
Guido Volpi
  • class TPie
Eckhard von Toerne
  • author of the TMVA package
Vassil Vassilev
  • cling co-author
Helge Voss
  • author of the TMVA package
Shaowen Wang
  • TOracleResult
Hady Zalek
  • contributed to Reflex
Andreas Zoglauer
  • contributed to TStyle::CreateGradientColorTable()

Our sincere thanks and apologies to anyone who deserves credit but fails to appear in this list.