"Project Runway" alum Jack Mackenroth here for AIDS Walk

"I'm 40 now, but my plastic surgeon tells me I look like I'm 30," jokes Jack Mackenroth, a former "Project Runway" contestant who will be in town Sunday taking part in the AIDS Walk. "I've been positive longer than I've been negative," says Mackenroth, who was diagnosed HIV-positive 20 years ago. His appearance is on behalf of Merck's Living Positive by Design HIV-education campaign. "We're trying to fight the stigma of HIV through visibility," he says.

As for "Project Runway," which airs on Lifetime, Mackenroth says he doesn't feel there's a standout this season, unlike Christian Siriano, who won in 2008, the year Mackenroth was on the show. "I think they weeded out most of the clutter. Everyone who's left is fairly talented," says the fashion designer. Mackenroth will speak before, and then walk in, the event. Proceeds will go toward the AIDS Fund, which supports 30 HIV organizations in the Delaware Valley.