Who is Josh Winkler from Next and what is their importance?

Josh Winkler works at BioGen. Josh works on a project that is testing a maturity gene on mice. One afternoon, while giving the mice the retrovirus that transmits the gene, Josh gets a call to pick his brother up at the courthouse. Josh's brother is a drug addict whose life is quickly going downhill. Josh takes the canister of mouse retrovirus with him when he leaves, because he does not have time to put it away properly. While Josh is getting gas, his brother administers the retrovirus to himself, hoping it will have something in it that will make him high. Within a few days, Josh's brother is off the drugs and is holding a full-time job.