As improbable as it sounds, the Sufi innovations in the Jewish religion begun by Abraham Maimonides were almost assuredly the single most important thing to happen to Jewish spirituality since the destruction of the Second Temple in 70 C.E.
At certain points, there is evidence for the direct influence of Sufism on Jewish spirituality.
Elsewhere, the path between the two is challenging to discern.Of course, the intermingling of these mystical streams has long since run underground, subterranean whispers from a time of mutual respect and mystical symbiosis between Islam and Judaism. But the stories of medieval Kabbalists, well known and unknown bear the mark of their work with the Sufis.
You can read the detailed biographies of these Jewish sufi's at ;http://www.tomblock.com/
The links between Islamic Sufism and Jewish Kabbalah deserve to be studied and celebrated, and efforts should be made to resolve the enigmatic history of their parallel and common pathways toward achieving the transformation of the ego.