He was the great-grandfather of Israel ben Petahiah Isserlein, who quotes him in his commentary on Rashi to the Pentateuch, section "Wayeḥi."
Israel was the author of Haggahot Asheri, notes on Rabbeinu Asher's Talmudic compendium, printed with the text.
Grätz identifies Israel of Krems with the Israel whom Emperor Rupert appointed, by a decree of May 3, 1407, chief rabbi of all the German communities ("Hochmeister über alle Rabbinen"), giving him a certificate declaring him to be a great Talmudic scholar and a good man.
But as Israel's functions included the civil control of the Jews, and especially the collection of the taxes, the German rabbis opposed his appointment.
The emperor, upon hearing of this, confirmed Israel's appointment as chief rabbi by a second decree (November 23, 1407), imposing a fine of twenty gold marks on any one refusing to submit to him.