The bunch of it was written by:
Marcus Brinkmann  <marcus@gnu.org>

The libhurd-slab allocator implementation (libhurd-slab/slab.c) was
written by:
Johan Rydberg <jrydberg@night.trouble.net>

The pthread implementation libpthread/, and the zone allocator
physmem/zalloc.h, physmem/zalloc.c was originally written by:
Neal H Walfield <neal@walfield.org>

The malloc implementation in physmem/malloc.c, task/malloc.c and
deva/malloc.c was written by:
Doug Lea <dl@cs.oswego.edu>

The serial output driver for laden and wortel (laden/output-serial.c,
wortel/output-serial.c) was written by:
Daniel Wagner  <wagi@gmx.ch>

The atomic data type support in platform/atomic.h,
platform/alpha/bits/atomic.h, platform/amd64/bits/atomic.h,
platform/ia32/bits/atomic.h, platform/ia64/bits/atomic.h,
platform/powerpc/bits/atomic.h and platform/powerpc64/bits/atomic.h
has been written by:
Ulrich Drepper <drepper@redhat.com>
Paul Mackerras <paulus@au.ibm.com>