Specialty: Obstetrics and Gynecological Services (OB/GYN) 
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925
920-623-1200

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

Dr. Katheryn Kaldor wants her patients to feel that the patient, her patient’s family and she are a team. Whether you are navigating a new pregnancy or preparing to have surgery, Dr. Kaldor wants you to feel confident that she is with you every step of the way. Her philosophy with patients is the same as her philosophy in life: always do the right thing. Dr. Kaldor received her Bachelor of Arts from the Kansas State University in  Manhattan, KS and her DO from the Kansas City University of Medicine And Biosciences, MO. She completed her residency at the Philadelphia College of Osteopathic Medicine, PA. She is a Fellow of the American Congress of Obstetrics & Gynecology (FACOOG) and is certified by the American Osteopathic Board of Obstetrics and Gynecology.

Specialty: Orthopedics
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925           
920-623-1200

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

Mandy is a valued member of the orthopedic team, specializing in preoperative and postoperative care as well as osteoarthritis. She enjoys working with patients one-on-one to provide a more individualized care experience. As a physician assistant, Mandy provides care to orthopedic patients in both clinic locations. She graduated from the University of Dayton, Ohio, Physician Assistant Program and also earned her B.A. from Edgewood College in Madison WI. Mandy grew up in the Madison area. In her free time, she enjoys reading, painting, boating, and spending time with her friends and family.

Specialty: General Surgery
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925           
920-623-1200

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

Dr. Robb Whinney has been providing care to patients for over 20 years and is fellowship-trained in surgical critical care and trauma surgery. He received his Bachelor of Science from Wilkes University in Wilkes-Barre PA and his DO from Philadelphia College of Osteopathic Medicine in Philadelphia, PA. He completed his residency in general surgery at Wyckoff Heights Medical Center in Brooklyn, NY where he served as Chief Resident. Dr. Whinney completed his fellowship training at Jackson Memorial Medical Center/ Ryder Trauma Center Miami, FL. He was an Associate Professor at Yale University and Washington University in St. Louis, covering the sections of Burn, Trauma, and Critical Care. Dr. Whinney is a board-certified general surgeon by the Fellow American College of Osteopathic Surgeons and the American College of Surgeons. Dr. Whinney sees patients at both the Columbus and Beaver Dam clinic locations.

Specialty: Orthopedics
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925           
920-623-1200

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

As a physician assistant, Andrew Tratar provides care to orthopedic patients in both clinic locations. Andy is a valued member of the orthopedic team specializing in sports medicine, joint and fracture care, as well as preoperative care for joint replacement patients. He graduated from the UW-Madison Physician Assistant Program and also earned his B.A. in Biology from Ripon College. Andy enjoys hiking, fishing, hunting, biking, archery, camping, and kayaking. He coaches baseball and enjoys attending local sporting events. He also enjoys woodworking, reading, cooking, and spending time with his children.

Fellowship Trained Hip and Knee Replacement Specialist
Specialty: Hip, Knee and Shoulder Replacement, Orthopedic Surgery
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925           
920-623-1200

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

Dr. Niesen is one of only a handful of surgeons in the state who holds the distinction of being fellowship-trained in orthopedic joint replacement surgery; specializing in hip, knee and shoulder replacement. He received his Bachelor of Science from the University of Wisconsin-Madison and his MD from the University of Wisconsin School of Medicine. He completed his residency at the University of California, Los Angeles, where he served as Chief Resident and was honored with the Longmire Surgical Society Research Award. He completed an additional fellowship in joint replacement at the Mayo Clinic and is certified by the American Board of Orthopedic Surgery. Dr. Niesen sees patients at both clinic locations.

Specialty: Orthopedics
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925          
920-623-1200

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

As a nurse practitioner, Judy MacDonald sees orthopedic patients at both Columbus and Beaver Dam clinics. She is the Care Coordinator for Prairie Ridge Health Orthopedic Excellence Team specializing in assisting you with all your care needs from the surgeon’s office, to the hospital, and home.

Judy earned her nursing degree from Marian University and her nurse practitioner master’s degree from Concordia University. She is a board-certified Family Nurse Practitioner through the American Nursing Credentialing Center. She belongs to the National League of Nursing and the Wisconsin Nursing Association. Judy has been working in healthcare for over 25 years. She enjoys spending time with family and friends, being in the outdoors, gardening, boating, hiking, and sports.

Specialty: Orthopedics
Prairie Ridge Health Clinic – Beaver Dam and Columbus

1515 Park Avenue
Columbus, WI 53925           
920-623-1200                     

134 Corporate Drive
Beaver Dam, WI 53916
920-356-1000

As a physician assistant, Tiana Imhoff provides care to orthopedic patients in both clinic locations. Tiana is a valued member of the orthopedic team specializing in sports medicine and osteoarthritis. She enjoys helping patients reclaim their lives. She received her Master’s of Science in Physician Assistant Studies from Rosalind Franklin University of Medicine and Science; prior to that, she attended the University of Wisconsin-Madison and the University of Wisconsin-Eau Claire for Physician Assistant Prerequisite coursework and a Bachelor of Science in Kinesiology with an emphasis in Human Performance respectively. Tiana grew up in Wisconsin. In her free time, she enjoys spending time with her family, gardening, boating, baking, and reading a good book.

Specialty: Family Practice

Prairie Ridge Health Clinic - Beaver Dam and Marshall locations

134 Corporate Drive
Beaver Dam, WI 53916
Phone: 920-356-1000

301 W. Main Street
Suite A
Marshall, WI 53559
Phone: 608-655-8181

Kris has provided primary care for over 14 years. She offers an array of services including wellness and prevention, treatment of acute illnesses, and chronic disease management for patients of all ages. She obtained her Bachelor's and Master's in Nursing from the University of Wisconsin  Oshkosh. She is certified by the American Nursing Association and the American Association of Nurse Practitioners. Kris grew up in Dodge County, Wisconsin. In her free time, she enjoys spending time with family, traveling, and quilting.