The translator is unknown - and the translation is literal rather than based on the underlying meaning of the words: the first line in the original text is about wishing a successful journey through life.
There are many, many musical settings of the text, which can also be used as a prayer.
Files to Download:
Lyrics:May the road rise to meet you.
May the wind be at your back.
May the sun shine warm upon your face.
May the rain fall softly on your fields,
And until we meet again,
May you keep safe in the gentle, loving arms of God.