Our Providers

Cheryl Wirth graduated from Texas Woman’s University (TWU) in 1976, with a Bachelors of Science degree in Nursing, then in the 1980’s for a Masters of Science in Nursing.  She worked in Nursing Staff Development at MD Anderson, then taught in the Associate Nursing Program in Tomball.  In the 1990’s, she returned to TWU  to become a Family Nurse Practitioner.  She has worked in Family Practice in the Magnolia area since 1997.  A longtime resident of Tomball, Cheryl spends her leisure time camping with her husband, granddaughter and a plenitude of friends.  Her lifetime motto is: “Enjoy every day, and ALWAYS dance in the rain!”

Dezarei Richey, MSN, APRN, GNP-BC

Dr. Michael Casagrande graduated from MIT with a Mechanical Engineering degree in 1989 and received his medical degree from the UT Health Science Center Houston in 1995. His internship and residency was at John Peter Smith Hospital in Ft. Worth, TX in 1998. Dr. Casagrande has been in practice since 1998 and is dual Board Certified in Family Medicine and in Sleep Medicine.  His specialties include insomnia, obstructive sleep apnea, narcolepsy and REM based sleep disorders. He is also recognized by Bridges to Excellence for Diabetes, Cardiac care, and Asthma.

Provider Careers:If you are an experienced NP or PA, and you are considering our office, you are welcome to fax us your resume so we can reach out to you if we have a spot open. 

Cheryl Wirth, RN, FNP-BC

Michael G. Casagrande MD, PA

Family & Sleep Medicine

Diana McGill, PA, ADN-RN

Diana graduated with an ADN- RN from Weber State College, in Ogden Utah. She received her Bachelors of Science in PA-C from the University of Utah 1991. From 1991-1996, she worked at MD Anderson Cancer Center in Head and Neck surgical oncology. From 1996-2018, she worked with Dr. Michael Barnard, MD in Family Practice. She has worked with a variety of patients, ranged school age to elderly. She specializes in women’s health and minor surgical in office procedures. She lives is the Tomball area with her husband. and has 2 sons. In her spare time, she enjoys fishing, hunting, and watching football, (both sons are college football players.)

About Us

Dr. Michael G. Casagrande, MD, PA, FAAFP, DABSM

Dezarei was Board-certified in 2009 as a Geriatric Nurse Practitioner from the American Nurses Credentialing Center. She was awarded her Bachelors and Masters from University of Texas Houston Health Science Center, and a Bachelor of Science in Psychology from University of Houston. She started nursing at Memorial Herman specializing in critical care, emergency medicine and peri-operative care.  She is currently caring for patients in the skilled nursing, assisted living,  and long-term care facilities in and around Tomball under Dr. Casagrande. 

Get to Know Us

Dr. Casagrande’s practice is a traditional Family Medicine practice in Tomball, TX, that also specializes in Sleep medicine. Our providers strive to practice medicine in a way that is becoming increasingly rare in our society, by listening to our patients and getting to know them.  These personal relationships along with over 20 combined years in medicine mean your experience at Dr. Casagrande’s practice will result in thorough personalized medical care. You will become accustomed to friendly smiling faces when you enter the clinic and a kind welcoming voice when you call.


We are almost completely paper-free using a state of the art Electronic Medical Record system and a convenient HIPPA compliant Patient Portal. Come visit us at Dr. Casagrande’s office for a unique healthcare experience and the most comprehensive medical care in the area.