Report summary

The 2025-2026 picture for Harvard University Department of Biostatistics is a 30-PI network with 6 internal PI collaborations. The main research signal is Biochemistry, Genetics and Molecular Biology as the leading field (25% of slots across 14 PIs; 14 labels), Statistics and Probability as the leading subfield (15% of slots across 10 PIs; 10 labels), and Advanced Causal Inference Techniques as the leading topic (6% of slots across 5 PIs; 5 labels). That is a thin collaboration pattern, useful for spotting individual pairs but less persuasive as a broad departmental network. The leading PI names are Tyler J. VanderWeele (13.9 weighted works; Academic Freedom and Politics, Sepsis Diagnosis and Treatment). The clearest collaboration lines are Sanghun Lee and Georg Hahn (3 shared works, weight 1.2). The leading breakdown groups are group 1 with 4 PIs, 3 internal connections, weight 0.8, around Artificial Intelligence, Public Health, Environmental and Occupational Health, Genetics, led by Xihong Lin, Tianxi Cai, Rui Duan.