Our Leadership Team


Medical Director

Dr. John D. McCallum, III

Dr. John D. McCallum, III, a board-certified orthopaedic surgeon, specializes in hip and knee problems including arthritic and sports related injuries. He has been an innovator of hip and knee arthroscopic surgery, salvage and reconstructive techniques, including minimally invasive treatments. Dr. McCallum, currently serves as the medical director of the Connecticut Orthopaedic Institute. More About John >>


Assistant Medical Director

Dr. Leonard Kolstad

Dr. Kolstad is certified by the American Board of Orthopaedic Surgeons and the Arthroscopy Board of America. He earned his medical degree from Creighton University and completed his residencies in both orthopaedics and family medicine at the University of Connecticut. More About Leonard >>


Director of Operations

Andrew Turczak, MHS, MBA, PA-C

Andrew performed his undergraduate training at Quinnipiac University graduating summa cum laude and earning his BS in 2007. Upon completion of this degree, he earned his MHS from Quinnipiac in 2009 in physician assistant studies. More About Andrew >>


Director of Anesthesia

Dr. Denisa Lujic, MBA

Dr. Denisa Lujic is a board-certified anesthesiologist. She graduated from Lehigh University with a BA in neurobiology and a minor in philosophy. She then went on to St. Georges School of Medicine earning her Doctorate of Medicine. She completed her residency in anesthesiology from the University of Connecticut where she served as chief resident and received the David B. Little award. Following her residency, she continued her education at the University of NewHaven, where she received her MBA. More About Denisa >>


Joint Replacement Program Coordinator

Dianne Vye, MSN, RN, ONC

Dianne Vye, MSN, RN, ONC is the joint replacement program coordinator for MidState Medical Center in Meriden and The Hospital of Central Connecticut in New Britain. She has been in orthopaedic nursing for 20 years, with extensive experience in orthopaedic program development. Dianne collaborates with other disciplines to provide education, support and consultation to enhance the quality of care delivered and develop services for joint-replacement surgery patients. More About Dianne >>


Advanced Practice Provider Clinical Manager

Thomas Mangano, MHS, MBA, PA-C

Tom performed his undergraduate training at Quinnipiac University, where he graduated magna cum laude in 2006. Upon completion of this degree, he received his MHS from Quinnipiac in 2008. After graduation, Tom worked as a physician assistant in the emergency department at The Hospital of Central Connecticut from 2008 to 2013. More About Thomas >>


Nurse Manager

Cathy Mangini, RN

Cathy has more than 35 years of experience in nursing, including patient care at the bedside, quality improvement and nurse management. Her focus is on patient satisfaction, delivering the best and safest care possible. More About Cathy >>


Physical Therapy Manager

Anna Malz, RPT

A physical therapist at the hospital for 27 years, Anna is truly dedicated to the success of her patients. By intently listening to each patient and carefully crafting plans based on the individual’s special needs, Anna provides the highest quality care possible, every day. More About Anna >>

Connecticut Orthopaedic Institute