Joe

Joe is a very cool man on the phone helping mom save the alternate world?

Joe is a man trying to fix the other-world and help Kate Greystone. He is an expert on gadgets. In The Strangers he helped the Greystone kids rescue the Gustano children. In The Deceivers he was rescued from the other-world by the Greystone kids and Natalie Mayhew, other-Natalie, and maybe Lana. It was also revealed his full name is Joe Deweese.