ext3 is a Journalizing file system for Linux. It was written by Dr Stephen C. Tweedie for 2.2 kernels.
The filesystem was ported to 2.4 kernels by Peter Braam, Andreas Dilger and Andrew Morton , with much valuable assistance from Stephen Tweedie.
Hurray. Now ext3 is merged into Linus kernel code from Kernel 2.4.15 onwards.