Physician Extenders and Staff

Nurse Practitioner

Petra Grinnell, APRN, FNP-BC, CDE
Petra Grinnell is a native of Germany and came to the United States in 1981. She earned her Associate Degree in Nursing at Bay de Noc Community College in Escanaba Michigan and finished her Baccalaureate in Nursing at Lake Superior State College, Sault Sainte Marie Michigan. After serving in   the Army Nurse Corp, Petra and her family decided that San Antonio, Texas is the place to raise their family. Petra has extensive experience in acute care and more than 15 years experience in diabetes. Petra graduated with her Master’s Degree in Nursing from UTHSCSA in 2010 specializing in Family Nurse Practitioner.

Petra’s professional interests are providing holistic care to patients with various endocrine disorders. She believes patients deserve undivided attention to their concerns during their visit and serves as a reliable source of information. Petra is a clinical preceptor for UTHSCSA School of Nursing graduate students. Petra is married and has two adult children. She enjoys reading, cooking, gardening and playing with her dogs.

RN: Bay de Noc Community College, Escanaba, MI 1984
BSN: Lake Superior State College, Sault Sainte Marie, Mi 1986
MSN: University of Texas Health Science Center at San Antonio, 2010

Family Nurse Practitioner Certification
Certified Diabetes Educator

Professional Memberships
Sigma Theta Tau International Honor Society of Nursing, American Academy of Nursing

Nuclear Medicine Technologist

Joseph Borrego RT (N) ARRT
Joseph Borrego was born and raised in San Antonio, Texas and began working for Endocrinology Nuclear Medicine Associates, PA in May of 1997. Joseph Borrego has two daughters and is married. On his time off he enjoys reading, spending time with his family, exercising, and cheering for our San Antonio Spurs. He is a huge advocate of eating healthy, staying fit, and passing it on to his family as well as his patients.

Hardin-Simmons University in Abilene, Texas 1992-1994
Brooke Army Medical Center San Antonio Military Medical Center-Nuclear Medicine Clinical Rotations 1995-1996
BS: Nuclear Medicine Minor in Physics-University of the Incarnate Word 1996

The American Registry of Radiologic Technologists achieved in 1996
Texas Department of Health Certified in Bone Densitometry in 1999