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Harvard University Department of Physics in 2021-2023 reads as a 78-PI network with 55 internal PI collaborations. The dominant subject mix is Physics and Astronomy as the leading field (43% of slots across 55 PIs; 55 labels), Atomic and Molecular Physics, and Optics as the leading subfield (17% of slots across 29 PIs; 29 labels), and Cosmology and Gravitation Theories as the leading topic (5% of slots across 11 PIs; 11 labels). Overall the pattern is balanced: there is enough structure to identify active groups, while the field mix still leaves room for multiple research identities. The leading PI names are L. Mahadevan (29.6 weighted works; Advanced Materials and Mechanics, Adhesion, Friction, and Surface Interactions); Xingcai Zhang (24.5 weighted works; Advanced Nanomaterials in Catalysis, Nanoplatforms for cancer theranostics). The most visible ties are Haoyu Guo and Subir Sachdev (8 shared works, weight 4.8); Mikhail D. Lukin and Hongkun Park (10 shared works, weight 4.6). The leading breakdown groups are group 1 with 10 PIs, 12 internal connections, weight 7.5, around Biomedical Engineering, Materials Chemistry, Atomic and Molecular Physics, and Optics, led by L. Mahadevan, Xingcai Zhang, David A. Weitz.