He helped develop the G-suit during WWII
Top-secret work on centrifuges was transformed after the war into life-saving cardiovascular research
SANDRA MARTIN
March 25, 2009
As an aerospace medical researcher, Earl Wood spanned the era from fighter pilots to astronauts.
The version of the G-suit that he helped develop for bomber pilots flying at high altitudes and fighter pilots who were blacking out in dogfights with the Japanese during the Second World War, made a successful transition to peacetime. In a modified and advanced form, these pressurized suits were used by the test pilots who broke the sound barrier and the astronauts who circled the globe and landed on the moon.
"As both a physician and researcher, Dr. Wood provided nearly five decades of outstanding leadership to Mayo Clinic and scientific advancements to the world," Denis Cortese, Mayo Clinic president and CEO, said in a news release. The author of more than 700 scholarly articles and several book chapters, Dr. Wood's research was also instrumental in modifying an air pressure gauge from an aircraft into the standard tool for measuring arterial blood pressure; developing the first diagnostic cardiac catheterization in humans; refining the heart-lung bypass machine to enable Mayo to perform open-heart surgery as a routine procedure; formulating indo-cyanine green dye to measure heart pump function in diagnosing congenital heart disease; and creating advanced X-ray imagery of the heart, lungs and circulation leading to an X-ray-based computed tomography machine that evolved into CT scanner technology.
Well into extreme old age, Dr. Wood continued to work and consult with colleagues around the world. "He was a giant as a person," said Jan Stepanek, a Swiss internist who is now medical director of the Mayo Clinic in Arizona. Dr. Stepanek credits Dr. Wood with sparking his own interest in researching aerospace medicine. "Many things are called mentorship today, but one key ingredient is a dedicated presence when people have time together," he said. "When you were sitting with Dr. Wood, nothing else mattered. He was there with you and for you and he was going to give you the most in-depth answers to your questions that you could ever hope for."
Born in the American Midwest before the First World War, Earl Wood was the second youngest of six children of William G. Wood and his wife Inez. Both his parents were teachers, despite their lack of secondary education, and his father also worked as a farmer and a real estate salesman. After attending local schools, he attended Macalester College, a liberal arts institution in St. Paul, Minn., graduating in 1934. Two years later, on Dec. 20, 1936, he married Ada Peterson, his college sweetheart. Together they raised four children.
"He was there for the individual, as an advocate for his graduate fellows, his students, his technicians and his family," said his youngest son Andrew (Andy) Wood, a wellness facility entrepreneur. "He was the ultimate in a leader because he emphasized people's strengths and leveraged those strengths," said Mr. Wood, explaining how his father took time to help him, "a severe dyslexic," learn to read and do math problems. "He basically got me through high school and into college and eventually graduate school. He was never critical, but he would come up with a plan and pose it in such a way that it seemed like it was my idea so I took ownership of it."
Dr. Wood earned postgraduate degrees, including a PhD and an MD at the University of Minnesota and a National Research Fellowship at the University of Pennsylvania, before being hired to teach pharmacology at Harvard University. That is where he met Charles Code, the Canadian-born physiologist who had set up an Aero Medical Unit in the late 1930s at the Mayo Clinic in Rochester, Minn., researching the deleterious effects of high acceleration on pilots of civilian and military aircraft.
A few months after the Japanese bombed Pearl Harbor, Dr. Code hired Dr. Wood to help solve a deadly problem affecting American pilots. Some of them were blacking out because blood was rushing from their heads and pooling in their legs as they climbed and swooped in bombing runs and dogfights with the enemy. Dr. Wood and other members of Dr. Code's research team turned themselves into human guinea pigs by building a human centrifuge in the lab.
The researchers took their experiments aloft in an Army A-24 plane, a Dauntless dive-bomber they called the G-Whiz, which made dives and loops over the Minnesota cornfields. These experiments in gravitational pull led them to develop a G-suit, with pouches or bladders around the legs that the wearer could pump full of air, thus blocking an excessive downward flow of blood and obviating the tendency for pilots to lose consciousness from a lack of blood in the brain.
This top-secret work on centrifuges was transformed after the war into internationally recognized cardiovascular research that extended to heart, lung and blood physiology and cardiac catheterization.
"Dr. Wood was absolutely instrumental in the development of cardiopulmonary bypass, a technology that saves hundreds of thousands of lives every year," Thoralf Sundt III, a Mayo Clinic surgeon, said in a statement.
Dr. Wood's academic career proceeded apace with his medical research. He became a professor in the Mayo Graduate School of Medicine in 1951. Seven years later, the U.S. Air Force and NASA asked Dr. Wood to continue his G-forces research with the result that he and his team began testing prototypes of the Project Mercury astronaut couches on the Mayo centrifuge.
By the early 1960s, Dr. Wood, who was head of Mayo Clinic's Cardiovascular Laboratory, was hosting research fellows, visiting scientists and clinicians who came to study in his lab and learn new techniques.
Even though he retired from the Mayo Clinic at age 70 in January, 1982, Dr. Wood continued to correspond and consult with researchers and colleagues from around the world. One of them was Dr. Stepanek, who, in the late 1990s, was investigating the differences between air- and water-pressured G-suits. The two men, one in his mid-80s and the other in his early 30s, began an e-mail and fax conversation. "It was probably the time in my life when I looked the smartest," said Dr. Stepanek, who would send questions in the late afternoon from Switzerland and stand by the fax machine the next morning to receive reams of technical reports and documents dating back to the Second World War from Rochester.
"He was sharp as a tack," Dr. Stepanek said. "I would never have gotten some of the ideas and some of the thought processes without the interaction with him."
Two years later, the two men met in Rochester. "He had grey hair and a sparkle in his eyes, he was minimally hunched over and slightly hard of hearing, but he was an extremely attentive listener," said Dr. Stepanek. "In everybody's career and life there are these moments when you have the opportunity to spend time with somebody who is not just talented and a scientifically brilliant person, but somebody who manages to influence your life," he said. "He was brilliant, humble and a gentleman. What a wonderful human being."
Earl Wood
Earl Wood was born on Jan. 1, 1912, in Mankato, Minn. He died March 18, 2009, in Rochester, Minn., of pneumonia following surgery for a broken hip. Predeceased by his wife Ada in 2000, Dr. Wood, who was 97, leaves four children and four grandchildren.