Squid Core Team
Henrik_Nordström, Squid Hacker Extraordinaire and Squid-2.x release manager.
Amos Jeffries IPv6 guru, Translations coordinator, and Squid-3.x release manager.
Adrian Chadd, Squid-2 developer, performance/scalability stuff.
Robert Collins was the main driver of the Squid-3 C++ migration effort.
Guido Serassio leads the SquidNT effort
Alex Rousskov manages various Squid-3 projects.
Duane Wessels, Chief Procrastinator
Certified Developers
Francesco Chemolli works mainly on documentation and maintains the wiki, but also chimes in with patches every now and then.
Steven Wilton is bringing the COSS storage engine to maturity
Other Contributors
Countless independent Contributors.