According to Valve Software's JIRA (a bug tracking software for development) leaked yesterday, both Half-Life 3 and Left 4 Dead 3 are currently in development at the studio, but who are the developers involved? And what did some of the most prominent ones do in the past?

NeoGAF user Angular Graphics compiled a nice list of the developers that appeared in the leaked webpage, and identified some for our perusal.

It's worth mentioning that the list may not be complete, as developers involved in a project may very well not be involved in Q&A testing.

Half-Life 3

  • Adam Foster <- creator of the Half-Life 2 mod "Minerva" then hired by Valve. He is a BRILLIANT level designer.
  • Alex Vlachos <- One of the company's main engine developers. He is responsible for introducing post processing effects in Source with The Orange Box games among other things. It's important to note, 2.5 months ago, he wasn't on the list. Hopefully that means the Half-Life 3 project has left the pre-production stage.
  • Alexander Mark
  • Alireza Razmpoosh
  • Andy Nisbet
  • Ariel Diaz
  • Bill Van Buren
  • Bill Fletcher
  • Chris Chin
  • Chris Green
  • Jess Cliffe <- CounterStrike Co-Creator.
  • Dario Casali
  • David Speyrer
  • David Feise
  • Erik Robson
  • Erik Wolpaw <- Portal 1 & 2 Writer.
  • Jan-Peter Ewert
  • Jeremy Bennett
  • Jean Rochefort
  • Jeff Lane
  • Jeff Ballinger
  • Jeff Hameluck
  • Jim Hughes
  • Jim Murray
  • John Guthrie
  • Josh Weier
  • Karl Whinnie
  • Kelly Bailey <- Valve's prominent musician responsible for the music in Half-Life, Half-Life 2 Episode 1 and 2 and Portal. He left the company in 2011. He appears to be back.
  • Ken Birdwell
  • Ken Banks
  • Marc Laidlaw <- Lead Half Life writer. 
  • Matt Alderman
  • Matt Charlesworth
  • Michael Coupland
  • Paul Pepera <- Halo 4 concept artist. He Joined the company in March 2013.
  • Paul Thuriot
  • Randy Lundeen
  • Roland Shaw
  • David Sawyer
  • Steve Kalning
  • Ted Backman
  • Ted Carson
  • Thorsten Scheuermann
  • Tristan Reidford
  • Torsten Zabka
  • Steve Bond <- Half Life Designer. He left Valve at some point but he appears to be back.

Half-Life 3 Core

  • Adam Foster
  • David Speyrer
  • Jean Rochefort
  • Jeff Lane
  • Jim Hughes
  • Karl Whinnie
  • Kelly Bailey
  • Ken Banks
  • Michael Coupland
  • Sergiy Migdalskiy

Left 4 Dead 3

  • Aaron Barber
  • Aaron Halifax
  • Alex Vlachos
  • Alexander Mark
  • Alireza Razmpoosh
  • Andy Nisbet
  • Ariel Diaz
  • Bank Charnchaichujit
  • Brett English
  • Andrew Burke
  • Cam Fielding
  • Chris Chin
  • Chet Faliszek <- Left 4 Dead and Left 4 Dead 2 Lead Writer
  • Jess Cliffe <- CounterStrike Co-Creator
  • Clint Hocking <- Creative Director of Splinter Cell, Splinter Cell: Chaos Theory, Far Cry 2.
  • Daniel Jennings
  • Dario Casali
  • Dave Kircher
  • David Feise
  • Dirk Gregorius
  • Don Holden
  • Doug Church <- worked on Ultima Underworld, System Shock, Thief
  • Doug Wood
  • Eric Kirchmer
  • Eric Douglas Strand
  • Eric Tams
  • Erik Robson
  • Erik Wolpaw <- Portal and Portal 2's writer
  • Garret Rickey
  • Iestyn Bleasdale-Shepherd
  • James Cunliffe
  • Jan-Peter Ewert
  • Jason Brashill
  • Jeremy Bennett
  • Jeff Ballinge
  • Jeff Hameluck
  • Jim Murray
  • John Guthrie
  • Josh Weier
  • Karen Prell <- Portal 2's Wheatley animator. Also worked on Left 4 Dead and Left 4 Dead 2.
  • Karl Whinnie
  • Kelly Bailey <- Valve's prominent musician responsible for the music in Half-Life, Half-Lofe 2 Episode 1 and 2 and Portal.
  • Kelly Thornton
  • Ken Birdwell
  • Ken Banks
  • Kerry Davis
  • Marcus Egan
  • Matt Alderman
  • Matt Charlesworth
  • Mike Morasky
  • Paul Pepera
  • Paul Thuriot
  • Phil Co
  • Philip Lafornara
  • Randy Lundeen
  • Reuben Fries
  • Roland Shaw
  • David Sawyer
  • Sergiy Migdalskiy
  • Steve Kalning
  • Steve Kody
  • Ted Backman
  • Ted Carson
  • Tejeev Kohli
  • Thorsten Scheuermann
  • Tristan Reidford
  • Torsten Zabka
  • Wade Schin
  • Steve Bond
  • Will Smith
  • Yasser Malaika

Left 4 Dead 3 Audio

  • David Feise
  • Emily Ridgway
  • Kelly Thornton
  • Marcus Egan
  • Mike Morasky
  • Roland Shaw

Left 4 Dead 3 Developers

  • Chris Green
  • Dirk Gregorius
  • Don Holden
  • Doug Church
  • Eric Tams
  • Garret Rickey
  • Iestyn Bleasdale-Shepherd
  • Josh Weier
  • Kerry Davis
  • Reuben Fries
  • Sergiy Migdalskiy
  • Ted Carson
  • Tejeev Kohli
  • Thorsten Scheuermann