There are 8 mathematicians whose last name begin with SSIEF.
| Siefert, Christopher | University of Illinois at Urbana-Champaign | 2006 |
| Siefken, Jason | University of Victoria | 2015 |
| Siefker, Andrew | Arizona State University | 1997 |
| Siefkes, Christian | Freie Universität Berlin | 2007 |
| Siefkes, Dirk | Ruprecht-Karls-Universität Heidelberg | 1969 |
| Siefkes, Hermannus | Friedrich-Schiller-Universität Jena | 1934 |
| Siefoddini, Arian | University of California, Davis | 2022 |
| Siefring, Richard | New York University | 2005 |