Can anyone identify the translation/translator of the Targum Psalms on this website?

[Doug Bell]

I assume you are referring to the Trilinear Targums.  The English translation of the "Tehilim (Psalms)" is the New American Standard Bible, which is a translation of the Hebrew, not the Aramaic. Both Lamsa and Rev. David Bauscher have translated the Psalms from the Aramaic. You can start there.