Dr. CHARLES CASSIDY, United States
3.9
Consultations 37
Reproductive Medicine
Doctor Introduction
Dr. CHARLES CASSIDY, United States
Dr. Cassidy earned a bachelor’s degree in engineering from the University of Notre Dame, then completed law school at Georgetown University and earned a master’s degree in philosophy. He practiced for two years with Catholic Charities in Los Angeles, followed by one year with Catholic Relief Services in Moldova. He graduated from the University of California, San Francisco School of Medicine and completed a family medicine residency at John Peter Smith Hospital in Fort Worth, Texas. During residency, he trained in natural reproductive technology at the Pope Paul VI Institute in Omaha, Nebraska, and received advanced training in obstetrics, surgery, ultrasound, HIV, and tropical medicine.
After residency, he volunteered for six months at a rural hospital in Haiti before moving to Green Bay in 2019 to work at St. Gianna Clinic.
At St. Gianna Clinic, Dr. Cassidy provides family medicine and women’s care. He believes patients should participate in shared decision-making.
“In an increasingly difficult healthcare system, I see myself as an advocate for patients,” Dr. Cassidy said. “I believe physicians are natural advocates for the poor, so I make an extra effort to help patients obtain the care they need.”
Dr. Cassidy provides routine care for children and adults and comprehensive obstetric and gynecologic services. As a certified FertilityCare medical consultant, he is trained to diagnose and treat gynecologic and reproductive health conditions using the Creighton Model FertilityCare System and NaProTECHNOLOGY®.
“My goal is to provide current information and recommendations to help patients choose the best treatment,” Dr. Cassidy said.
Dr. Cassidy is fluent in English and Spanish and is certified by the American Board of Family Medicine.
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Location and Hours
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Monday
08: 00 - 17: 00
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Tuesday
08: 00 - 17: 00
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Wednesday
08: 00 - 17: 00
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Thursday
08: 00 - 17: 00
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Friday
08: 00 - 17: 00
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Saturday
Closed
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Sunday
Closed
- Closed Now
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Featured Reviews
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Kai E
2 years ago
Mar 8, 2025
Slow, unhelpful service. Two nurses sat together doing nothing but talking. Almost no one here was available to help anyone. No one should come here.
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Cecilia Heiman
2 years ago
Sep 27, 2024
Dr. Renaldi is amazing! He explained everything exceptionally well and was very kind. He answered every question without making me feel rushed. He clearly cares deeply about helping patients and is an expert in his field. 10/10! I highly recommend him!
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Laurindo
2 years ago
Aug 24, 2024
Edit: I was instructed to inject progesterone into the buttock area/muscle, which caused terrible scar tissue. Several other NFP clinics I have visited since going to St. Gianna's 4 years ago have warned me how harmful this can be. Progesterone injections should be given above the buttock, not into the buttock muscle. I hope they update their instructions and information for current and future pregnant patients.
If you want to be treated with care, dignity, and respect while surrounded by some of the kindest medical professionals you will ever meet, come here.
Thank God for this beautiful clinic and everyone who works here!
St. Gianna—pray for us!
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Bree Hornes
1 year ago
Aug 27, 2025
I gave this practice more than one chance because my NICU nurse recommended it, as her family owns it, and I really liked her as a nurse. But I have had enough and transferred both children to another practice. I could never reach my children's provider; they always ended up seeing Katie. Katie is wonderful to work with, but it was frustrating because Bayer was supposed to be their provider and I could never reach him. If he cannot communicate with his current patients, perhaps he should stop accepting new ones. What really upset me was calling because I was concerned my child might have RSV—something every mother of a NICU baby will understand—and it took them about a week to respond. I am glad I went elsewhere to have her examined and make sure it was not serious. I later called to say I would be about 15 minutes late for my daughter's 6-month appointment because I live an hour away. I would have been on time if the GPS had not directed me to the wrong exit. They did not check with the nurse and doctor until 15 minutes later, so I had already arrived when they told me that because half the appointment time had passed, I would have to wait or reschedule. Most doctors allow a 15-minute grace period, and honestly, every time I bring my children to an appointment here, they take us back later than the scheduled time.
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Taylor Schiavo
10 months ago
Nov 14, 2025
We drove an hour and a half to be seen here due to so many recommendations from friends/colleagues. Well worth the drive.
Dr. Reinardy was extremely thorough and informative. He was very knowledgeable and up to date with recent studies and info released. He took the time to really explain things to us, answered every question we had, and created a manageable step-by-step course of action.
Excellent doctors can be hard to find these days, but this clinic is fantastic. The level of care provided here is unmatched!
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Tony V
10 months ago
Nov 14, 2025
I had an excellent experience at the Saint Gianna clinic. I arrived with a problem in my left knee and left without any pain. Best of all, Dr. Cassidy and the wonderful nurse explained the entire treatment process in detail, so I fully understood what to expect.
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Kathy DeGreef
10 months ago
Nov 6, 2025
I scheduled an appointment for insomnia, which worsens my anxiety and depression. Dr. Katie Daniels was wonderful. She is an excellent listener, showed great empathy, shared her faith, and prayed for me. She offered several treatment options, and I will return if my condition does not improve. Many thanks to Dr. Katie and the Saint Gianna clinic. This is an excellent practice.
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Brenda thomson
9 months ago
Dec 12, 2025
St. Gianna Clinic is excellent in every way, from the warm and attentive staff and kind nurses to the highly skilled, professional doctors. I recommend St. Gianna Clinic to all patients.
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blueyes868
9 months ago
Dec 6, 2025
I absolutely love Dr. Cassidy and have been seeing him for five years. He is approachable, very thorough, knowledgeable, compassionate, and always identifies the root cause of the problem. The nurses at this clinic are also wonderful and always warm and friendly 😊 I am so glad I changed clinics and found him instead of going "abroad," as I had previously been advised.
J
Jim Allen
9 months ago
Dec 4, 2025
Staff members Natalie and Katie make appointments very easy. They listen carefully to your concerns and help you recover.
A
Ana Rodriguez
9 months ago
Nov 30, 2025
Dr. Renaldi is amazing! I also love that this is a Catholic clinic. God bless everyone who works there!
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Maille Phillips
6 months ago
Mar 5, 2026
The physicians and nurse practitioners are kind and highly knowledgeable about health across pediatrics, fertility, pregnancy, and other areas. I came to St. Gianna's expecting high-quality care and to feel understood and seen, both literally and figuratively. Instead, after waiting months to see Dr. Guevara, I experienced countless appointment cancellations, was sent to the wrong ultrasound clinic, had my bloodwork order mishandled, and received no proactive follow-up after my bloodwork and ultrasound results arrived. I had to call repeatedly for my laboratory and ultrasound results, only to be transferred each time to a nurse who always seemed to find a way to end the call without providing any answers. I would rate the physicians and nurse practitioners 8 out of 10, but the front desk staff and nurses only 2 out of 10. At times, they lacked empathy and provided inaccurate information. Staff have even confused me with other patients in the clinic. Communication is poor, and calls placed before closing often receive no timely response.
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Nickole Faustina-Anne
6 months ago
Mar 27, 2026
Katie Daniels is amazing. She is very thorough at every visit and truly takes the time to understand the root of my concerns. This is the first time I have felt truly heard... A Catholic clinic is such a great option 🙂
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Rusty Pelican
6 months ago
Mar 25, 2026
They have always taken excellent care of me and my family. The staff are very kind, thoughtful, and compassionate. I highly recommend St. Gianna Clinic.
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Monica Wiegand
6 months ago
Mar 21, 2026
Our whole family loves this clinic. We transferred everyone here after feeling overlooked and treated like a number at Prevea and Bellin. I appreciate how much time the providers spend talking with us. This is what health care should be.
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Kaylyn Laskowski
4 months ago
May 14, 2026
Dr. Guevara and her entire staff are very knowledgeable and professional. I am glad I changed gynecologists. She is not only highly skilled but also willing to listen to my complex medical history. They always respond quickly to any questions I have. Even more reassuring, she shares my faith-based values.
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Elisabeth Rymer
4 months ago
May 12, 2026
Katie was wonderful. She was very patient with my energetic toddlers, who repeatedly asked why, and carefully explained each test and what she was examining. She answered all my questions and concerns, and I left feeling very reassured about my children's health.
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Hailey King
4 months ago
Apr 28, 2026
would NOT recommend this clinic to anyone - especially expecting working mothers. My initial appointment with them has been rescheduled last minute twice all within 10 mins of when my appointment was supposed to be. I have had to take off extra days at work due to their poor planning. They should not be able to accept new patients as their excuse is they always have emergencies and never enough doctors. I am very behind on my prenatal care, stressed dealing with this clinic, and am seeking care elsewhere. Doesn’t seem like they have their patient’s best interest at heart.
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Sarah Rajski
5 months ago
Apr 25, 2026
Dr. Bayer is very kind, nonjudgmental, and a good listener. He always explains conditions thoroughly in language children can understand and never seems rushed. We moved away from the area, but despite having many pediatricians nearby, we chose to remain his patients. I also appreciate the clinic's faith-based approach. I highly recommend him.
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1716 Lawrence Dr, De Pere, WI 54115, United States
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