Peter Shalen
| Peter Shalen | |
|---|---|
| Alma mater | Harvard College (BA, 1966); Harvard University (PhD, 1972) | 
| Known for | JSJ decomposition | 
| Scientific career | |
| Fields | Mathematics, Topology | 
| Institutions | University of Illinois at Chicago | 
| Doctoral students | Nathan Dunfield | 
Peter B. Shalen (born c. 1946) is an American mathematician, working primarily in low-dimensional topology. He is the "S" in JSJ decomposition.