William Henry Andrews (born December 10, 1951) is an American molecular biologist and biogerontologist whose career is centered on searching for a cure for human aging.

In 1993, Andrews convinced Berlex to send him to an anti-aging conference at Lake Tahoe, California, where he met Calvin Harley of Geron Corporation.

[1][5] In 1998, Andrews founded Yonder Technologies, that later became Sierra Sciences in 1999 in Reno, Nevada, with the specific goal of curing human aging.

[2] From 1999 to 2005, Sierra Sciences' focus was to identify the telomerase repressor protein, in the hopes that a drug could be specifically designed to bind to it.

[2] In 2005, Andrews switched to the "brute force" strategy of developing assays to screen large numbers of random chemicals to determine whether they induced expression of telomerase.

[1] In November 2007, after nearly two years of screening, Sierra Sciences discovered the chemical C0056784,[2] which induces approximately 5% as much telomerase as is found in the immortal cancer cell line HeLa.

[12] In 2010, Andrews and Sierra Sciences entered into an agreement with John Anderson, founder of Isagenix International, to use the new assay to screen natural ingredients for telomerase activity.