She had a doctorate from a medical institute near Paris and she was doing research that was similar to his, so the biography said. They married and became a team, and when he was asked by Harvard Medical to found a department for molecular genetics, she was immediately offered a tenured position there too. Harvard considered it a double coup.

His research was zeroing in on the telomerase protein, an enzyme many scientists believed was responsible for suppressing the aging process in stem cells. Could it be used to regenerate tissue?

He was well along on the task of exploring that tantalizing possibility when tragedy struck. Camille, who had worked around the clock during her residency at Johns Hopkins, began feeling weak at Harvard and was diagnosed with acquired aortic stenosis. After a 2 1/2‑year struggle, she died during a severe cardiac episode.

My God, Ally thought, that's what I have.

After Camille died, he left Harvard and its time‑consuming academic obligations and went to work full‑time at a research institute affiliated with Stanford University. He even formed a paper company to structure the work, the Gerex Corporation. But then there came a second strike against him. He was doing research using embryonic stem cells obtained from the discarded embryos at fertility clinics. After two years of harassment by right‑wing political groups, Stanford decided his research was too controversial and terminated his funding.

Three months later, Karl Van de Vliet merged his company with Bartlett Medical Devices and moved his research staff east to New Jersey, to the Dorian Institute. That was five years past, and now his research using stem cells was in third‑stage NIH clinical trials.

The official history ended there, though with a strong hint that the final chapter was yet to be written. Then at the back there was a bibliography of publications that extended for eight pages, and included a summary of the most important papers. His work on stem cells and the telomerase enzyme appeared to be at the forefront of the field.

Oddly, however, some of his writings also were philosophical, an argument with himself whether his work could be misused to alter the natural limitations life imposes. One of those papers, from a conference presentation in Copenhagen, had a summary, and in it he pondered whether the use of stem cells to rejuvenate the body might someday give medical science godlike powers.

The Greeks, he declared, had a myth about the punishment reserved for those who sought to defeat our natural life span. When the goddess of the dawn, Aurora, fell in love with the beautiful youth Tithonus and granted him immortality, it turned out to be a curse, since he still reached the decrepitude of age but had to suffer on forever because he could not have the release of death.

But, Van de Vliet pondered, if we could find a way to arrest the aging process in our body's tissue, might we escape the process of aging? If so, was this a good thing? Or might this be a step too far that would bring on unintended, and as yet unknown, consequences?