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Sidney D. Drell, a physicist who served for nearly half a century as a top adviser to the United States government on military technology and arms control, died on Wednesday at his home in Palo Alto, Calif. He was 90.

His death was confirmed by his daughter Persis Drell.

Dr. Drell combined groundbreaking work in particle physics — he was deputy director of the Stanford Linear Accelerator Center, now the SLAC National Accelerator Laboratory, for nearly 30 years — with a career in Washington as a technical adviser and defense intellectual.

In 2000, he was given the Enrico Fermi Award for his life’s work, and in 2013, President Obama presented him with the National Medal of Science for his contributions to physics and his service to the government.

Beginning in 1960, as the Cold War heated up, Dr. Drell served on a succession of advisory groups that helped advance the technology of nuclear detection and shape the policy of nuclear deterrence.

As a founding member of the Jason defense advisory group, a panel of defense scientists, he helped develop the McNamara Line, a barrier that was intended to halt the infiltration of soldiers and weapons into South Vietnam from the north through a system that combined electronic surveillance with mines and troop concentrations at strategic points.

Dr. Drell was a strong proponent of nuclear deterrence during the Cold War. “I believed that given the Soviet empire, its stated goals and existence, we had to deter them,” he said in an interview for “The Partnership: Five Cold Warriors and Their Quest to Ban the Bomb” (2012), a book by Philip Taubman, a former reporter and editor for The New York Times.

“We had to be clear,” he added. “These are not weapons we want to use, but they have to know that should they monkey around with us, they had to expect we’re going to use them against them, and at a degree that’s unacceptable to them.”

At the same time, he was a leading advocate of arms control and a critic of major projects such as the MX missile and the Strategic Defense Initiative, the Reagan administration program also known as Star Wars.

Dr. Drell was recruited as a consultant for the Arms Control and Disarmament Agency soon after its creation in 1961 and served as a director of the Center for International Security and Arms Control (now the Center for International Security and Cooperation) at Stanford University in the 1980s. In 2006, he and George P. Shultz, the secretary of state under Ronald Reagan, founded a program at the Hoover Institution to propose practical steps to rid the world of nuclear weapons.

“In dealing with terrorists or rogue governments, nuclear deterrence doesn’t mean anything — the value has gone,” he told the website In Menlo in 2012. “Yet the danger of the material getting into evil hands has gone up. So what are existing nuclear arms deterring now? In this era, I argue that nuclear weapons are irrelevant as a deterrence.”

Sidney David Drell was born on Sept. 13, 1926, in Atlantic City, to Jewish immigrants from the Russian empire. His father, Tully, was a pharmacist. His mother, the former Rose White, was a teacher.

He was admitted to Princeton at 16 and earned a degree in physics in 1946. At the University of Illinois, he obtained a master’s degree in physics in 1947 and a doctorate in 1949.

After teaching at Stanford for two years, he joined the physics department at the Massachusetts Institute of Technology. He left in 1956 to work under Wolfgang K. H. Panofsky at the Stanford Linear Accelerator Center.

As an academic, Dr. Drell specialized in quantum electrodynamics, which describes the interactions between light and matter, and quantum chromodynamics, which explores subatomic particles like quarks and gluons.

He and Tung-Mow Yan, a research associate at the accelerator center, formulated a key concept in particle physics when they explained what happens when a quark in one particle collides with an antiquark in a second particle, an annihilating confrontation that yields an electron and a positron. The sequence of events became known as the Drell-Yan process.

Dr. Drell was the author of “Electromagnetic Structure of Nucleons” (1961) and, with the theoretical physicist James D. Bjorken, wrote the textbooks “Relativistic Quantum Mechanics” (1964) and “Relativistic Quantum Fields” (1965).

As the head of the theory group at the accelerator center, which gathered leading scientists to discuss nuclear science, he found himself in demand as a technical adviser on defense and security.

In 1960, Dr. Drell was invited to join an advisory group led by Charles H. Townes, the father of the laser. His task was to see whether orbiting infrared sensors could detect a Soviet intercontinental missile launch by picking up a heat reading from the missile’s exhaust plume. Additionally, he had to determine whether the Soviet Union could nullify the sensors by exploding a nuclear device in the atmosphere before the main launch.

After he and his team judged such an explosion impractical, the Defense Department went ahead with plans to develop the Missile Defense Alarm System.

He later served on the Land Panel, which developed a new system for taking high-resolution, wide-range photographs from spy satellites.

During the Vietnam War, Dr. Drell’s service on the President’s Science Advisory Committee under Lyndon B. Johnson and Richard M. Nixon, and his role as a shadow adviser to Henry A. Kissinger, damaged his academic reputation as opinion turned against American policy. Increasingly, he found himself fending off attacks in public forums.

“Call it entrapment, commitment or whatever, but I have remained actively involved in technical national security work for the United States,” he told Mr. Taubman.

After the war, he emerged as a leading thinker on arms control and disarmament, which he addressed in numerous books and papers, including “Facing the Threat of Nuclear Weapons” (1983), “The Reagan Strategic Defense Initiative: A Technical, Political and Arms Control Assessment” (1985), “In the Shadow of the Bomb: Physics and Arms Control” (1993) and “The Gravest Danger: Nuclear Weapons” (2003).

In addition to his daughter Persis, who directed Stanford’s accelerator laboratory for five years, he is survived by his wife of 64 years, the former Harriet Stainback; another daughter, Joanna Drell; a son, Daniel, and three grandchildren.

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While Russia poses one of the biggest foreign policy challenges facing the U.S., an opportunity for rapprochement may exist with the incoming administration, several Stanford scholars said Wednesday.

The panel event, “Russia Looking Back and Looking Ahead,” featured Russia experts William J. Perry, Michael McFaul, Siegfried Hecker, and David Holloway from Stanford’s Center for International Security and Cooperation and the Freeman Spogli Institute. The discussion came at a time when American-Russian relations are arguably at their lowest point since the end of the Cold War. On top of this, the Central Intelligence Agency recently concluded that Russia interfered in the U.S. presidential election. Against this backdrop, the Stanford scholars examined both the past and the future of the U.S.-Russia relationship. (Click here to watch a video of the event.)

Amy Zegart, CISAC co-director, said in opening remarks that there is “no more timely moment to be looking at the state of U.S.-Russia affairs than today.”

Perry, a former U.S. Secretary of Defense and director of the Preventive Defense Project at CISAC, said that he hopes Russia does not fall prey to its worst tendencies, the way the Weimar Republic of Germany succumbed to Nazism. Perry pointed out, however, that some bright spots in Russian cooperation have occurred.

“You could never have predicted that was going to work,” he said, referring to the post-Cold War cooperation between the U.S. and Russia in reducing and safeguarding the latter’s nuclear stockpile. There was also collaboration on solving the Bosnian conflict in the 1990s.

“The greatest disappointment is that we let all this slip away,” said Perry, citing the NATO expansion as one trigger effect. “Our greatest challenge is trying to avoid a war with Russia. We’ve gotten to a point where that is a real possibility.”

The Russians, Perry noted, realize they’re outgunned by the U.S. in conventional weapons, so they have made it known they may use tactical nuclear weapons in the event of a war with America.

Perry urges re-engaging with Russia on nuclear issues. The best approach, he said, may be to separate out some problems that may be too difficult so the focus is on nuclear cooperation. Still, he acknowledges he is "profoundly pessimistic,” but what is at stake is the survival of human civilization, so these two countries must find a way to work together. 

Protests and people

McFaul, the director of the Freeman Spogli Institute, recently penned a column urging a bipartisan examination of Russian involvement in the 2016 election.

McFaul explained the Obama Administration’s efforts to engage with Putin’s Russia. He served in the administration during that period that some refer to as an attempted “reset” of Washington’s relationship with Moscow. Some cooperation definitely occurred – the successful raid on Osama Bin Laden would not have happened without Russia’s collaboration, among other examples, he added. “It was an amazing achievement."

Why did the reset end? “It ended because protesting people got in the way of our policy,” he said, noting mass protests in Russia and in Middle Eastern countries that were allies of Putin’s regime.

“We were not imposing our values on the government when I was in office,” said McFaul about his tenure as U.S. ambassador to Russian from 2012 to 2014.

On Trump, McFaul expressed cautious optimism, but described him as exhibiting “mixed-up ends and means,” and Trump seems to suggest everyone “should just get along.” Putin, on the other hand, has very clear strategic priorities, McFaul said. 

“There’s a history of interference,” he said about Russia’s forays into elections here and abroad.

In addition, many issues have connections – such as the Iran nuclear deal and the Russian relationship – that are so complex that the new administration needs to truly understand the broader context, he said.

Prior nuclear agreements - such as Nunn-Lugar – were viewed in Moscow as American intelligence efforts, McFaul said. This reflects Russia’s wariness to talk about nuke issues.

‘A country coming apart’

Hecker, a senior fellow at CISAC and FSI, recently wrote an article about how the recent U.S. election may have opened a window of opportunity on U.S. Russia nuclear cooperation. The idea for the panel originated from the publication of Hecker’s recent book, Doomed to Cooperate.

Hecker recalled his career as the director of the Los Alamos National Laboratory, where they were faced with helping strengthen the U.S. against Soviet nuclear capabilities, to the years of transition after the Cold War when he led U.S. efforts over a 20-year period to work with Russian scientists on safeguarding loose nukes.

“'They were Russia’s inheritance from Hell,'” he said, quoting a passage in a book by moderator David E. Hoffman, a contributing editor to The Washington Post and Russian expert as well.

The scientists in Russia, however, were heroically motivated to collaborate with American scientists like Hecker in protecting their country from a nuclear catastrophe. “It was like looking in a mirror,” Hecker said about their talents and conscientiousness.

Such scientific collaboration and support from both countries’ governments is a template for future relationships, he said. Unfortunately, that type of cooperation is “being held hostage” by political differences in both countries, said Hecker, who has visited Russia 52 times in 25 years.

“There is no reason we should be enemies,” he said.

Hecker suggests not “demonizing” the Russian people and avoiding imposing American values on those people. Staying out of internal affairs in Russia is critical, too, he said.

‘Not the Soviet Union’

Holloway, a senior fellow at CISAC and FSI, has analyzed the steps taken to shrink the world's nuclear stockpile.

“Russia’s not what people hoped it would become 25 years ago, but still something remains. This is still not the Soviet Union,” said Holloway, pointing out some limited freedoms exist in contemporary Russian society compared to the country’s Stalinist past.

“The failure to integrate Russia into the international system” has created a serious problem, he said. “We’ve had a real downward spiral” since the Obama administration’s attempted reset. “There is a debate about who is to blame,” but that is a complicated debate.

“What is to be done?” asked Holloway. This is the question to ask and answer in order to ascertain ways to improve the relationship. The liberal world order, created by the U.S. in the wake of WWII, may be coming to an end, he said. China and Russia feel they have not been accommodated by such a U.S.-led world order, such as in trade deals and military alliances.

Like Putin, who uses unpredictable tactics in world affairs, Trump, too, seems made from the same template.

“This is not good to have two unpredictable leaders facing each other” with many nuclear weapons at their commands, said Holloway, who recently visited Russia and observed many reactions there about the 2016 election outcome.

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Clifton B. Parker, Center for International Security and Cooperation: (650) 725-6488, cbparker@stanford.edu

Editor’s Note: The following article by CISAC's Siegfried S. Hecker is part of a multi-part symposium commissioned by the National Interest and Carnegie Corporation of New York. They asked some of the world’s leading experts about the future of U.S.-Russia relations under President-elect Donald Trump. You can find all of their answers here.

By Siegfried S. Hecker

Nuclear is different. Nuclear energy can electrify the world or destroy it. Cooperation is essential to maximize its benefits and to limit its dangers. President-elect Trump should move swiftly to reestablish U.S.-Russian nuclear cooperation, which has been held hostage to political differences.

Whereas political relations between the United States and Russia have swung from confrontation during the Cold War, to cooperation in its aftermath, and now back to confrontation, combating nuclear risks has required dialogue and at least some modicum of cooperation. In spite of bitter ideological differences during the Cold War, U.S. and Russian leaders took cooperative measures to avoid nuclear confrontation, reduce nuclear stockpiles and limit the proliferation of nuclear weapons.

The collapse of the Soviet Union transformed the global nuclear threat—from potential annihilation of humankind by the enormous nuclear arsenal in the hands of the Soviet government, to the possibility that the new Russian government may lose control of its tens of thousands of nuclear weapons, over one million kilograms of fissile materials, a huge nuclear infrastructure, and the several hundred thousand nuclear experts and workers it had inherited from the Soviet Union.

The safety and security of Russia’s nuclear assets posed an unprecedented challenge for the world as well as for Russia. An equally unprecedented cooperation between Russia and the United States during the past twenty-five years has greatly enhanced the safety and security of Russia’s nuclear complex and helped avoid a nuclear catastrophe.

Although President Putin has reemphasized the role of nuclear weapons in Russia’s security and has suspended or terminated most nuclear cooperation with the United States, President-elect Trump must work with Russia to jointly develop an acceptable path to avoid nuclear confrontation and combat global nuclear dangers. The first order of business must be to develop mutually agreed conditions to ensure strategic stability and avoid a new nuclear arms race.

Whereas nuclear safety and security in Russia’s nuclear complex has improved greatly, these are never-ending quests that require continued collaboration—sharing best practices and lessons learned, cooperating on training, and assisting other countries. Likewise, cooperation to prevent the proliferation of nuclear weapons and nuclear terrorism is in the interest of both countries. The Iranian nuclear deal is a recent example of what the two countries can achieve by working hand in hand. North Korea is another case that warrants cooperation because interests converge.

The president-elect should also listen closely to Russia’s expressed desire to expand the benefits of the atom—particularly to collaborate on peaceful nuclear technologies and the safe global expansion of nuclear energy.

The U.S. election may have opened a window of opportunity to return U.S.-Russian relations to cooperation. There is no better place to start than with nuclear cooperation.

Siegfried S. Hecker is the author of Doomed to Cooperate, a two-volume compendium of articles on U.S.-Russian nuclear cooperation. Follow him at @SiegfriedHecker. 

A hot springs summit between Japanese Prime Minister Shinzo Abe and Russian President Vladimir Putin next week hopes to solve the 70-year-old dispute over an isolated string of islands that Russian and Japanese nationalists both claim as their own, according to Daniel Sneider, associate director for research at the Shorenstein Asia-Pacific Research Center.

Read the commentary piece in Foreign Policy here.