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About the Author: Dr. Daniel Monahan
![](https://veinfocus.com/wp-content/uploads/Dan-7-12-16-1-150x150.jpg)
Daniel L. Monahan, M.D. opened Vein Surgery and Treatment Center of Northern California in 2001. The name changed to Monahan Vein Clinic in 2011. He is board-certified in surgery and a fellow of the American College of Surgeons. Treating vein disease is not something to learn in a weekend course. Dr. Monahan’s formal training included more experience in vein treatment than typical surgical training, and he carried this expertise into his practice.