BT colorDr. Tonnessen graduated from Brown University with honors in Neuroscience in 1994.  She subsequently received her medical degree at the Mayo Clinic in Rochester, MN.  She completed a residency in general surgery and fellowship in vascular surgery at the Ochsner Clinic in New Orleans, and has been a practicing vascular surgeon since 2006.

Dr. Tonnessen is board certified in general and vascular surgery, and is a Fellow of the American College of Surgeons.  She primarily sees patients in the greater Poughkeepsie area.

Dr. Tonnessen has expertise in both open surgery and minimally invasive “endovascular” procedures for treating vascular disease.   She resides in Poughkeepsie with her husband Brian and enjoys running 5Ks, hiking, and traveling.


Medical School/Degree

Mayo Medical School

Rochester, MN

M.D. 1999



Brown University

Providence, RI

B.S. with honors, 1994


Post-Graduate Training

General Surgery Residency

Ochsner Clinic

New Orleans, LA