GNU Sed was first authored by Jay Fenlason (hack@gnu.org)
and later modified by Tom Lord (lord@gnu.org).

Ken Pizzini (ken@gnu.org) and Paolo Bonzini (bonzini@gnu.org)
took over and maintained it for many years.

GNU Sed is currently being maintained by Jim Meyering (jim@meyering.net)
and Assaf Gordon (agn@gnu.org).