It’s tempting to start with the science, because the science is dazzling. But when Yifan Cheng stepped into the lab at UCSF Mission Bay for our portrait session, what struck me first wasn’t his CV. It was the quiet confidence of a man in a track jacket, his usual uniform, paired with the unmistakable posture of a marathoner. And not just any runner: Cheng has completed more than thirty marathons, each one a testament to stamina, discipline, and an ability to find rhythm in complexity. All qualities that define his scientific work, too.
Born in China, Cheng’s early fascination with physics took him through a rigorous academic path, eventually leading to a Ph.D. in condensed matter physics. But it wasn’t until he encountered electron microscopy, and more specifically, cryo-electron microscopy (cryo-EM), that his curiosity found its ideal medium. At the time, cryo-EM was still an emerging field, often dismissed as too noisy, too low-resolution to be useful for serious molecular biology. Cheng saw something else.
He joined the University of California, San Francisco, where the interplay between basic science and translational medicine provided fertile ground for his ideas. Working alongside Nobel laureate Thomas Südhof and structural biologist David Agard, Cheng helped develop critical advances in cryo-EM that would eventually revolutionize structural biology. His innovations improved resolution dramatically, allowing researchers to see molecular structures at near-atomic detail without the need for crystallization, a breakthrough that turned cryo-EM into one of the most powerful tools in modern biology.
But Cheng didn’t just ride the wave of a technological shift; he helped build it. His 2013 paper in Cell was a landmark, revealing the structure of the TRPV1 ion channel, a receptor involved in pain sensation, and demonstrating that cryo-EM could achieve resolutions previously thought impossible without X-ray crystallography. In the years since, his lab has illuminated countless biological structures, from ion channels to membrane proteins, each one a small miracle of image reconstruction and molecular storytelling.
Despite the accolades, and there have been many, including membership in the National Academy of Sciences, Cheng remains disarmingly grounded. His colleagues describe him as generous, meticulous, and quietly intense. His students, some of whom have gone on to launch labs of their own, speak of him with a kind of reverent warmth. He doesn’t demand excellence; he models it, patiently, day after day.
There’s something almost poetic about Cheng’s dual devotion to the microscope and the marathon. Both require endurance, of course, but also a deep comfort with solitude, with incremental progress, with returning to the same problem over and over until it gives way. In both pursuits, success is less about force and more about rhythm, a kind of moving meditation that rewards patience and precision.
And yet, Cheng isn’t austere. He laughs easily. He’s a father. He tells stories. During our shoot, there was a quiet playfulness to him, the way he adjusted a sample tube like a prop, or paused to consider whether the track jacket was “too on-brand.” It wasn’t. It was exactly right.
In a world obsessed with breakthroughs, Cheng is a reminder that deep, careful work, the kind that builds the foundation for future revolutions, is its own kind of heroism. He didn’t set out to transform biology. He just wanted to see things more clearly. And in doing so, he’s helped all of us do the same.
