Theodore Ts'o

b. 1968, United States · Linux Foundation Fellow; ext4 maintainer; author of `e2fsprogs`, `tune2fs`, `kerberos`

Also known as: Ts'o, tytso

Theodore "Ted" Ts'o was the first North American Linux kernel developer. He wrote the code that connected an MIT modem pool to the internet in 1991 so students could download Linux, and has been one of the most prolific kernel contributors since.

He is the long-standing maintainer of the ext2, ext3, and ext4 filesystems, which have stored the data of most Linux systems since the mid-1990s. He authored e2fsprogs and ported the Kerberos 5 authentication protocol to Linux. He is a Linux Foundation Fellow.