He is Bruno Levine's assistant. He is given tasks ranging from serving Bruno coffee to counting incoming and outgoing money. By name, one might infer that he is Jewish and is very similar to Bruno, he may be his son, nephew, or another blood relation such as a second cousin because in this type of Bruno's organization you need people you can trust so family members are often safe bets. Also, Isaac is a common name for baby boys in Jewish families; the original Isaac from the Bible being credited as the "Father of the Jews".
- He bears a striking resemblance to one of the car dealers in Jimmy's Vendetta.