Mary has lived in Arizona all her life and knew as a young girl that she wanted to become a nurse and care for people.

Mary graduated from the University of Arizona in 1981 with her Bachelors of Science in Nursing. After working many years in the hospital setting she decided she wanted to put her focus on the preventative end of the health care system. 

She attended ASU and received her Masters of Science in Nursing in 1998 and became certified as a Family Nurse Practitioner through the ANCC in 1998.

Mary notes that we all have a part,  but the moment is now and hopes to educate and provide the tools necessary for each patient to look forward and have positive outcomes with their health and well-being. Much of this attention will be placed on lifestyles that include good nutrition and and exercise.

Mary enjoys hiking, reading, exercise, experimenting with recipes and spending time with family and friends.

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Dr. Lorretta McCarthy

Dr. Lorretta McCarthy was born and raised in Chicago, Illinois. She married her high school sweetheart in May of 1996, then a month later in June 1996, graduated from Midwestern University- Chicago College of Osteopathic Medicine and moved to Phoenix to do her family medicine residency. She enjoyed the warm winters and sunshine so decided to stay in the area. She practiced urgent care medicine for 7 years then returned to family practice in 2006 because she missed the relationship with the patients, which is a vital part of being a primary care physician. 

She is board certified in Family Medicine. She is the first and only physician in her family and thinks that her interest in medicine came from her father who was a medic in the army but was unable to pursue his dream of becoming a doctor due to supporting his family. She also attributes her interest in medicine to being intrigued at an early age with the human body and the interest in learning everything about it while helping people. 

Her hobbies and interests include hiking, biking, travel, and photography. Her healthcare philosophy focuses on treating the whole patient with compassion, dignity and comprehensive care including a major emphasis on preventative care. She wants to work with each patient as a team to keep him or her happy and healthy. 

​​​Grand CanyoN Family Medicine P.C.

Dr. Robert Tognacci

​​Annie Hart, PA-C

Annie attended A.T. Still University Arizona School of Health Sciences in Mesa, AZ. She completed her clinicals in an underserved community health center in central California where she rotated in a number of subspecialties including family medicine, behavioral health, pediatrics, ob/gyn and internal medicine. She then completed her surgical and emergency medicine rotations in her hometown of Gilbert where she planned to begin her career in family medicine.  

Annie's interest in healthy lifestyle, preventive care as well as studying Human Nutrition at Arizona State University helped make her decision to become a Physician Assistant. She is passionate about treating the whole patient; body, mind and spirit. Family practice encompasses her interest in a variety of medicine as well as building individual and unique partnerships with each patient she sees.      

Our Team

At Grand Canyon Family Medicine, we are only as strong as our staff and are proud to employ a variety of qualified individuals who bring their own diverse knowledge to the practice in order to ensure you receive the most comprehensive treatment possible. Please take a moment to read more about our individual staff members and learn how they allow our practice to continually be the absolute best at caring for your health needs.

Mary A. Quihuis FNP-BC

A native of Arizona, Annies' interests include spending time with husband, their two dogs as well as family and friends. 

She also enjoys hot yoga, brunch and binge watching shows on Netflix.  Annie and her husband are also very passionate about their dog rescue volunteer work and plan to foster dogs waiting for their forever homes. 

Dr. Bob Tognacci was born in Boulder, Colorado and moved to Arizona in 1984.  He spent most of his childhood here in Chandler and graduated from Chandler High School.  After graduating from Northern Arizona University, Dr. T decided to pursue his love of science and commitment to the healthcare of others by becoming a family practice physician.  He graduated from Midwestern University in 2003 with a doctorate in Osteopathic Medicine.  He completed his residency in family practice medicine locally, at Mesa General Hospital.   Dr T. opened Grand Canyon Family Medicine in 2007.  His mission is to provide caring, quality health care for the people of his community.  Dr Tognacci was named Humanitarian of the Year in 2006 by the Arizona Osteopathic Medical Association.


Doctor T has been married to his high school sweetheart for 20 years and they have 3 energetic kids! He enjoys attending their many school and sports activities and is a staple on the soccer field sideline.  He is a fanatic Denver Broncos fan and an avid hiker.  He loves to get out and explore as much as possible.   


(480) 786-4441