Doctors You Can Trust

Dr. Dennis J. Bradley

Born and raised in Cedar Rapids, Iowa, Dr. Bradley has been in this area for over 30 years. From an early age he knew he wanted to help people in the healing arts and considers it a privilege and honor to be in the chiropractic profession. Initially planning to go to medical school (as his great grandfather and great great grandfather were both medical doctors) Dr. Bradley “discovered” chiropractic during college. Being exposed firsthand to chiropractic’s remarkable results caused him to decide to dedicate his life to the practice of chiropractic instead.

Dr. Bradley received his chiropractic education at Palmer College of Chiropractic in Davenport, Iowa. He graduated Summa Cum Laude and received numerous academic honors including the President’s Award, President’s List, and Pi Tau Delta (Chiropractic Honor Society). Additionally, he was listed in Who’s Who Among Students in American Colleges and Universities in 1997, and in the United States Achievement Academy’s All American Scholars Collegiate Directory from 1995 through 1997. While attending he earned an additional Bachelor of Science degree, and a Doctor of Chiropractic degree. He graduated in 1997 and immediately moved back home to Cedar Rapids.

Constantly striving to give his patients the most up to date care possible Dr. Bradley is dedicated to continuing education. He keeps abreast of the field’s research, as well as attending post graduate seminars in advanced chiropractic adjusting, diagnostic procedures, and nutrition. He focuses on exercise rehabilitation, ergonomics, injury prevention, and wellness. Dr. Bradley is trained in many treatment techniques and strives to specifically tailor treatment plans to what is best for each individual patient.

Dr. Chris A. Smith

Dr. Smith is originally from Lourdes, Iowa, and graduated from New Hampton High School. He was introduced to chiropractic during his high school years as a result of his active involvement in sports. He realized quickly that chiropractic not only made him feel better but also helped him reach optimal performance. His undergraduate studies include a Bachelor of Arts degree in biology and pre-medicine from the University of Northern Iowa. He completed his doctorate at Palmer College of Chiropractic in Davenport, Iowa, graduating Cum Laude. Dr. Smith has advanced training in extremity adjusting, decompression traction therapy, nutrition and weight loss, as well as chiropractic implementation into athletics. He is also certified to use Active Release Technique which is one of the most advanced and effective soft tissue techniques for athletic injury.

Before opening his own practice in Cedar Rapids, Dr. Smith worked in Albuquerque, New Mexico, and North Richland Hills, Texas, as an associate doctor. While working in other areas of the country, Dr. Smith treated many people with a wide variety of needs. As a result, Dr. Smith has enhanced his adjusting styles and techniques. He customizes every adjustment to best fit the needs of each patient.

Dr. Smith enjoys spending time with his wife, Kerry, daughter Chloe, and sons Kael and Kavan. Dr Smith also enjoys participating in sporting activities such as kickboxing, weight lifting, and snow skiing. The Smith family are members of St. Joseph Catholic Church in Marion.

Dr. Nathan Broghammer

Dr. Nathan Broghammer was born in Cedar Rapids and raised in the nearby town of Coggon. His interest in chiropractic sparked after suffering a severe low back injury while learning to barefoot water ski. The injury prevented Dr. Broghammer from walking or bending without experiencing intense, sharp pain. The day after the accident he went to a chiropractor and received instant pain relief from his first chiropractic adjustment. Dr. Broghammer continued treatment and within a week he had almost completely recovered and could move without pain.

Dr. Broghammer received his Doctorate of Chiropractic from the prestigious Palmer College of Chiropractic in Davenport, Iowa in 2008. He graduated with honors and learned the latest in spinal adjusting techniques, patient diagnosis, and physiotherapy. The Doctor of Chiropractic program requires over 300 credit hours and 4,500 class room hours to be completed over the course of three and one third years. Since graduating Palmer Dr. Broghammer has continued his education to become a DOT Certified Medical Examiner. With this designation he is able to provides DOT physical examinations as wall as drug testing for individuals and businesses in the area that utilize a commercial drivers license. Prior to attending Palmer College of Chiropractic Dr. Broghammer earned his bachelor’s degree in biology from Simpson College in Indianola, Iowa. He was extremely involved with campus activities including Residence Life Staff, Lambda Chi Alpha Fraternity, and the Simpson Wrestling Team. Dr. Broghammer earned Academic All-American honors in 2004 and 2005 as a member of the Simpson Wrestling Team. Dr. Broghammer received his high school education at North-Linn High School in Troy Mills, Iowa.

Currently Dr. Broghammer resides in Marion with his wife Rachel and two children, Owen and Quinn. In his time outside the office you may find Dr. Broghammer working out at Crossfit 151 or enjoying time on the water boating or waters skiing.

Dr. Amanda O’Sullivan

Dr. Amanda O’Sullivan is from Solon, Iowa and a graduate of Solon High School. She continued her education at Kirkwood Community College and then proceded complete undergraduate studies at the University of Iowa. Dr. O’Sullivan knew that she wanted to be in the healthcare field early on in life. She discovered Chiropractic care when her asthma was getting worse and noticed that her back was also sore at the same time. Getting adjusted helped with her asthma to the point where she has not needed her inhaler for years now.

Dr. O’Sullivan attended the prestigious Palmer College of Chiropractic in Davenport and graduated in 2013. While in school she participated in a clinic abroad trip to Fiji where she adjusted an abundance of men, women, and children. She offers several adjusting techniques including Activator technique which utilizes a very effective low force adjusting instrument that is safe and comfortable for the youngest of patients.

Dr. O’Sullivan currently lives in Cedar Rapids. She loves spending time with her family; especially her husband Sean, daughter Willow, and son Kaden. She loves to be outside, fish, camp, boat, hunt, and just be with her family and friends.

Dr. Ronni Miller


Dr. Ronni grew up in a small town in northwest Illinois.  She was a 2014 graduate of Eastland High School. While in school, she was always very active, playing volleyball year around. She used to go see a chiropractor quite frequently to stay in good health and to help prevent injuries. Dr. Ronni graduated in 2017 from Carroll University in Waukesha Wisconsin with her Bachelor of Science in Exercise Science. She originally intended to use that degree to apply to graduate school to be a physical therapist. However, she got a job working for two chiropractors and had a change of heart. She knew that’s how she wanted to help and serve people the rest of her life, so she applied to Chiropractic school within 2 months of working that job. She feels very honored to have found her purpose and passion.

Dr. Ronni attended the prestigious Palmer College of Chiropractic in Davenport, Iowa where she graduated in October of 2021. While at Palmer, Dr. Ronni was active in pediatrics club, extremities club, and was a teaching assistant and proctor for the radiology and diagnosis department.   She worked as an associate chiropractor for a year and a half in Hudson Iowa before making the move to Cedar Rapids. Her boyfriend, whom is also a chiropractor that graduated in the same class, owns an upper cervical chiropractic office in Cedar Rapids. It was always their goal to live in Cedar Rapids or the surrounding area. Dr. Ronni has a passion to help moms and kids maintain their health with chiropractic care.

Dr. Ronni and her boyfriend currently live in Independence. In her free time, you will find Dr. Ronni hanging with her friends and family or out on the water! She loves to go boating, fishing, and anything outdoors!