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David Chisnall

David Chisnall is an active contributor to a number of Free Software projects. He is responsible for Objective-C support for non-Apple platforms in Clang and has contributed to several other parts of the compiler. He is the original author of libcxxrt, which provides the low-level C++ ABI support. Libcxxrt was developed for PathScale and was open sourced by the FreeBSD and NetBSD Foundations and will form the base of the new C++ stack in FreeBSD 10.

Under sponsorship from the FreeBSD Foundation, he implemented the missing parts of FreeBSD's libc to support libc++ and ported libc++ to FreeBSD. After this work, libc++ passed more of its test suite on FreeBSD than on Darwin, where it was originally developed.

He is also an active contributor to the GNUstep project, including being the author and maintainer of the GNUstep Objective-C runtime. He is a member of the core team of the Étoilé project, which aims to build a desktop environment on top of GNUstep. His contributions to this project include a framework for easily implementing dynamic languages and a Smalltalk compiler that is ABI-compatible with Objective-C built on top of this framework. He was invited to give a talk at the 2011 International Smalltalk Conference about this implementation. A full list of his open source contributions is available from Ohloh.

David Chisnall is the author of several books: The Definitive Guide to the Xen Hypervisor, Cocoa Programming: Developer's Handbook, Objective-C Phrasebook, and Go Phrasebook.