Jan Witowski

Jan Witowski is the co-founder and CEO of Ataraxis AI, a New York precision-medicine company building AI models that read cancer tissue to predict how a patient's disease will behave and which treatments will help. A physician-scientist with an MD and PhD, he spent a decade in medical imaging research at Harvard, Massachusetts General Hospital, and NYU Langone before spinning Ataraxis out of NYU in 2023. The company's first product, Ataraxis Breast, is billed as the first AI-native prognostic and predictive test for breast cancer, and it raised a $20.4 million Series A in 2025 led by AIX Ventures.