By Martin Weil

The Washington Post

Kary Mullis, who shared a Nobel Prize in chemistry for devising a technique vital in DNA research and technology, and who appeared to be one of the most unconventional winners of the award, died Aug. 7 in Newport Beach, California. He was 74.

The cause was pneumonia, said his wife, Nancy Cosgrove Mullis.

The technique for which Kary Mullis shared the Nobel in 1993 was known as polymerase chain reaction, called PCR for short, and it enabled scientists to make millions or billions of copies of a single tiny segment of the DNA molecule.

Often described as a major milestone of 20th-century biochemistry and molecular biology, the PCR technique opened the way for a wide variety of studies and applications of DNA, the celebrated molecule that lies at the foundations of life.

In only one of many applications, PCR was used by evolutionary biologists to study the minuscule quantities of DNA discovered in the fossils of ancient species. The possibilities suggested by this technique inspired the creation of dinosaurs in such fictional films as “Jurassic Park” (1993).

Widely acknowledged for its significance, PCR not only rewarded Mullis with the most coveted prize in science, but it provided a platform that he bestrode with relish for his free-spirited, often quirky ideas and lifestyle.

A writer, a surfer and a restless, questing personality who once turned from science to manage a bakery, Mullis published a memoir titled “Dancing Naked in the Mind Field” (1998).

It embellished his reputation for happily ignoring the normal strictures, cautions and conventions that were observed by so many others in science and scholarship, particularly those at the exalted levels of Nobel winners.

It is true that, despite the title of his memoir, he did not appear unclothed on its dust jacket. But few if any other Nobel winners published anything showing themselves bare-chested with a surfboard tucked under an arm.

Among the exploits and adventures for which he was known was experimentation with LSD, the hallucinogenic drug. It was this that reportedly made the defense team representing O.J. Simpson, the former football standout acquitted in 1995 on charges of murdering his ex-wife and her friend, decide against calling him as an expert witness.

Although the trial has often been depicted as a courtroom circus, Mullis once told an interviewer that it was feared that his appearance might have only made the proceedings seem more of one.

A 1966 chemistry graduate of Georgia Tech, who earned a doctorate in 1973 from the University of California at Berkeley, he appeared in many ways to be one of the most prominent representatives in the scientific community of the mindset of the counterculture that was centered in California in the 1960s.

In his Nobel lecture, he told the assembled dignitaries that “six years in the biochemistry department didn’t change my mind about DNA, but six years of Berkeley changed my mind about almost everything else.”

A fount of ideas sufficiently offbeat to make fellow scientists frown, he seemed skeptical of much conventional wisdom, including theories that were widely held in science. Doubts about whether climate change was man-made, or whether HIV caused AIDS, helped make him seem an outlier in the scientific establishment.

In addition, his apparent enthusiasm for astrology and seeming fondness for such ideas as astral projection and the possibility of abduction by aliens also led his scientific peers to look at him askance.

Such flouting of scientific norms led one colleague to reportedly characterize him as an untamed genius.

Kary Banks Mullis was born Dec. 28, 1944, in Lenoir, North Carolina, and started life near the Blue Ridge Mountains, where his forebears had roots. When he was about 5, the family moved to Columbia, South Carolina

After receiving a doctorate in biochemistry from Berkeley, Mullis did research at other universities before joining Cetus Corp., then a San Francisco Bay area biotechnology firm, where he said he “was working when I invented PCR.”