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Gregory Richterich is a native Oregonian, born in Portland. He graduated from The Dalles High School and Portland State University with degrees in biology and math. In the early 1970's he spent three years in Africa with the Peace Corps.

Dr. Richterich graduated cum laude from Oregon Health & Science University in 1980. He completed an internal medicine internship at Providence Medical Center in 1981 and a dermatology residency program at Oregon Health & Science University in 1984.

Since that time, Dr. Richterich has practiced medical and surgical dermatology in Eugene, Oregon. His practice emphasis is diagnosis and treatment of skin diseases and surgery for skin cancer. His kind and caring nature is evident in the longevity of his many loyal patients.

Dr. Richterich is certified by the American Board of Dermatology. In addition, he is a member of the Oregon Medical Association, the American Medical Association and the American Academy of Dermatology.

Dr. Richterich enjoys hiking, skiing and is a marathon runner. He lives with his wife in Eugene, Oregon. They have two grown daughters.


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Amanda Weinman was born and raised in Eugene, OR. She attended the University of Southern Colorado for her first two years of undergraduate studies on a leadership and softball scholarship. She graduated Magna Cum Laude from Oregon State University, where she obtained her Bachelor's degree in Biology with an emphasis in Pre-Med in 2001. Amanda earned her Master's of Science degree in Physician Assistant Studies in 2006 from Pacific University in Forest Grove, OR. She is board certified through the National Commission on the Certification of Physician Assistants and is licensed through the Oregon Board of Medicine.

Since joining Cascade Dermatology in 2006, Amanda has proven herself as a proficient, compassionate full-time dermatology provider. She focuses on preventative medicine, skin cancer screening and quality care for all patients.

Amanda is an active member of the Society of Dermatology Physician Assistants, American Association of Physician Assistants, Oregon Society of Physician Assistants, the Portland-Vancouver Physician Assistant Society and the Oregon Medical Association.

Her personal interests include traveling, scuba diving, skiing, reading and spending time with family and friends. She also enjoys hiking and running.

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For more information about Physician Assistants and their role in the medical field, please visit the American Academy of Physician Assistant's website: