| Date | Speaker(s) | Title |
| 15 Jan 2009 | Nigel Higson, Penn State | On the "quantization commutes with reduction" problem, 1 |
| 22 Jan 2009 | Nigel Higson, Penn State | On the "quantization commutes with reduction" problem, 2 |
| 5 Feb 2009 | Ping Xu, Penn State | Group valued momentum maps, 1 |
| 12 Feb 2009 | Ping Xu, Penn State | Group valued momentum maps, 2 |
| 19 Feb 2009 | Nigel Higson, Penn State | On the "quantization commutes with reduction" problem, 3 |
| 26 Feb 2009 | Nigel Higson, Penn State | On the "quantization commutes with reduction" problem, 4 |
| 5 Mar 2009 | John Roe, Penn State | On physics and Bott periodicity |
| 19 Mar 2009 | Yi-Jun Yao, Penn State | Some results on open manifolds with a Lie group action (d'apres others) |
| 26 Mar 2009 | Daniel Cibotaru, Notre Dame | Localization formulae in odd K-theory |
| 2 Apr 2009 | Yuri Zarhin, Penn State | An invitation to toric varieties, 1 |
| 9 Apr 2009 | Yuri Zarhin, Penn State | An invitation to toric varieties, 2 |
| 16 Apr 2009 | Dmitry Scheglov, Penn State | On the Newlander-Nirenberg theorem |
| 23 Apr 2009 | John Skukalek, Penn State | C*-algebras and the Mackey analogy, 1 |
| 30 Apr 2009 | John Skukalek, Penn State | C*-algebras and the Mackey analogy, 2 |
| 20 Aug 2009 | | To Be Announced |
| 27 Aug 2009 | John Roe, Penn State | Where Geometry, Analysis and Algebra Meet |
| 3 Sep 2009 | John Roe, Penn State | Riemann Surfaces - II |
| 10 Sep 2009 | | NO SEMINAR TODAY |
| 17 Sep 2009 | Claude Roger, Universite de Lyon 1 | Lie algebra cohomology, inifinite-dimensional symplectic structures and Hamiltonian systems |
| 24 Sep 2009 | | To Be Announced |
| 1 Oct 2009 | | To Be Announced |
| 8 Oct 2009 | John Roe, Penn State | C*-Algebras, Foliations and K-Theory 2 |
| 15 Oct 2009 | Tyrone Crisp, Penn State | C*-Algebras, Foliations and K-Theory 3 |
| 22 Oct 2009 | Nigel Higson, Penn State | Continuous fields of Hilbert spaces |
| 29 Oct 2009 | Jean Renault, Universite d'Orleans, France | TBA |
| 5 Nov 2009 | Allan Yashinski, Penn State | C*-Algebras, Foliations and K-Theory 4 |
| 12 Nov 2009 | Yi-Jun Yao | C*-Algebras, Foliations and K-Theory 5 |
| 19 Nov 2009 | Piotr M Hajac, IMPAN - Poland | Toeplitz quantum projective spaces |
| 26 Nov 2009 | Thanksgiving week-No talk | To Be Announced |
| 3 Dec 2009 | Shmuel Weinberger, Chicago | "Topology and Social Choice" - Combined with MASS Colloquium in MB114 |
| 10 Dec 2009 | | To Be Announced |