Rachel calls Joshua to apologize to him but when he arrives at her apartment, Rachel, Monica, and Phoebe are all wearing wedding dresses which freaks Joshua out and he leaves again. He is the father of Elizabeth Stevens, Ross's student who he ends up dating.
She eventually convinces an originally unwilling Paul to tell her more about himself, but he goes a little too far, as he begins sharing childhood memories that were particularly traumatizing for him.
Rachel gets him two Knicks tickets so they can go on a date but Joshua thinks she is giving the tickets to him, so he says he will take his nephew to the game.
At the end of S4 E13 a wallet is found at Bloomingdale's, which the driver's license reveals is owned by "Joshua Burgin," to which Rachel plays kissy face with her own license.
Eventually, when Rachel sees the two arguing, she finally sees the similarities between them and walks away, disturbed.
She later breaks up with Russ, who consequently becomes depressed and one day while hanging out at the coffee shop is spotted by Ross' ex-girlfriend Julie, who is likewise depressed after Ross broke up with her.