The package is now obsolete, replaced by the mathptmx package, which supports Times Roman text and (mostly) matching mathematics.

The package remains available, for compatibility; both it and mathptmx are part of psnfss.

The font itself is part of Adobe's “basic” set, and is typically only available to users as part of their printer firmware.

See also txfonts newtx.

The author is Sebastian Rahtz.