Organ transplant lists are notoriously long. Sometimes a patient in need has to wait years to receive a transplant, if they are lucky enough to receive one at all. The most successful transplants come from living donors, but a faithful friend isn't always a medical match to her friend in need. Enter MatchGrid, a biomedical program designed to match potential kidney donors and recipients. MatchGrid was created by former WIRED editor and kidney recipient David Jacobs. His program established a method to match twelve people and create a six-way kidney transplant chain.