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For Princeton University Department of Physics in 2015-2017, the graph shows 37 visible PIs and 12 internal PI collaborations. The main research signal is Physics and Astronomy as the leading field (53% of slots across 30 PIs; 30 labels), Nuclear and High Energy Physics as the leading subfield (17% of slots across 14 PIs; 14 labels), and Black Holes and Theoretical Physics as the leading topic (7% of slots across 8 PIs; 8 labels). That looks relatively sparse, so claims about department-wide cohesion should be made carefully. The most prominent PIs by weighted works are M. Zahid Hasan (12.3 weighted works; Topological Materials and Phenomena, Advanced Condensed Matter Physics). The clearest collaboration lines are Grigory Tarnopolsky and Simone Giombi (6 shared works, weight 4.2); Ali Yazdani and B. Andrei Bernevig (6 shared works, weight 3.3). The strongest breakdown groups are group 1 with 4 PIs, 5 internal connections, weight 7.3, around Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry, led by B. Andrei Bernevig, N. P. Ong, Ali Yazdani.