David Julius stands at the edge of his office in Genentech Hall, framed by a city of science, glass towers and steel labs stretching across UCSF’s Mission Bay campus. It’s April 2022, and sunlight filters in behind him, casting a soft glow across an eclectic collection of objects: a globe, a miniature Taj Mahal, framed photos, and a pepper-shaped sculpture that hints, just barely, at the scientific revolution he helped ignite.
He’s dressed in a sharp, dark suit, and a patterned scarf rests lightly over his shoulders, not quite casual, not quite formal. Like him, it seems comfortable straddling two worlds. Julius has the bearing of someone who’s thought long and hard about things that matter but never lost his sense of humor about the absurdities that often come with them.
His calm presence belies the fireworks of discovery that have defined his career. A Nobel laureate in Medicine, Julius is best known for uncovering the molecular mechanisms of how we sense temperature and pain. It started, in part, with a question both simple and profound: why does chili pepper burn?
That inquiry led Julius and his team to TRPV1, a receptor that responds to capsaicin, the compound that makes peppers hot, and, more importantly, to heat itself. In one elegant leap, he had linked a culinary experience to a fundamental sensory pathway. Later work revealed how menthol produces a cooling sensation, and how mustard oil provokes pain, guiding the discovery of additional receptors that together form a kind of molecular atlas of touch and temperature.
There’s something wonderfully grounded about Julius’s approach. He often describes his work in terms of curiosity, and there’s no performative grandiosity in how he talks about pain or neuroscience. For him, it’s about uncovering how organisms, us, mice, even birds and fish, navigate the world through sensations. The fact that those sensations can be mapped to specific ion channels is, for Julius, a kind of magic worth pursuing for its own sake.
His work sits at the intersection of molecular biology and experience. In an era increasingly abstracted by data and algorithms, Julius’s focus on the physical body feels almost radical. His discoveries have already reshaped how we think about pain, and they hold promise for developing non-opioid painkillers, a clinical frontier still just taking form.
But if you ask Julius what drives him, it’s the thrill of discovery, the quiet satisfaction that comes from unraveling a puzzle of nature. He lights up not when listing accolades, but when recalling a bold experiment that revealed something new, or even one that failed, but pointed the way forward.
In person, he’s thoughtful and quietly amused, with a warm presence that invites conversation. During the shoot, he took time to move through the space with curiosity and care, adjusting a book here, making room for the camera there. His eyes carry the kind of intelligence that listens before it speaks.
Behind him, in his office, are small monuments to a life of inquiry, some formal, like the framed Society for Neuroscience award; some personal, like the globe and pepper, which nod to the global impact of his research and the unlikely provocateur that helped set it in motion.
Science is often portrayed as a solitary endeavor, but Julius’s career is a testament to collaboration: with his wife, Holly Ingraham, herself a celebrated neuroscientist; with the students and postdocs who’ve passed through his lab; and with the wider scientific community, where his name is spoken with admiration and a kind of fond respect.
In a world that sometimes forgets how intimately science is tied to human experience, David Julius reminds us, with grace, rigor, and a twinkle in his eye, that the body, in all its complexity, still holds mysteries worth chasing.
