For those who need a primer:
"Jack first gained national attention on Season 4 of the hit designer reality competition TV show, Project Runway. A favorite that season, just after winning a challenge, Jack was forced to leave the competition early when he developed a serious staph infection, made more complicated because of his HIV status."
http://www.thebody.com/content/80993/going-xxx-hiv-positive-activist-jack-mackenroth-co.html
While Mackenroth's XXX videos on this site are surprisingly sparse, you can find quite few on another gay torrent site. He specializes in bareback, kink, and I caught one clip of him partnered with a FTM.