Well, I don't really care who they are.  Exploring their site, I came across this:

"Cyclebeads
The Standard Days Method (SDM) was developed in 1999 at the Institute for Reproductive Health at Georgetown University. SDM is inspired by surveys that show that well over 60 million women worldwide report using periodic abstinence to avoid pregnancy--though they don't usually know when they are fertile. By using CycleBeads, a color-coded string of beads, women whose cycles are usually 26-32 days long are able to identify the days when they can conceive, and the days when conception would be very unlikely. SDM takes about 20 minutes to learn, and is more than 95 percent effective when used correctly. It's currently offered by state health departments, Planned Parenthood clinics, church-based groups and private providers in the US and internationally. While SDM provides no information about how the body works, nor indicators of gynecological health, I think this method is a good option for couples who don't have the time to learn Fertility Awareness, for women who aren't inclined to be intimate with their bodily processes, and for those who don't have literacy."

Not exactly the kind of reproductive information I expect to see from a REPUTABLE source.