Pediatric Cardiology Center of Oregon Providers
James P. Kyser, M.D.
Interventional Cardiologist
Interventional catheterization procedures
Dr. Kyser joined the Pediatric Cardiology Center of Oregon as an Interventional Cardiologist in July 2005. Dr. Kyser received his medical degree from the Ohio State University College of Medicine in Columbus, Ohio, and completed his pediatric residency training at Kaiser Oakland Pediatrics in California. He returned to Ohio for his pediatric cardiology fellowship training at Rainbow Babies & Children’s Hospital in Cleveland.
There he was well-trained in interventional catheterization procedures, including the latest developments in the use of cutting balloons, placement of intravascular stents, device closures of septal defects, and percutaneous pulmonary (Melody valves).
Dr. Kyser grew up in southern California and earned his undergraduate degree at UCLA. He has two boys and they are a very active family that enjoys the outdoors. Their move westward put them closer to family, whose locations range from Washington to southern California. Dr. Kyser likes to spend his free time enjoying many sports. He has a particular passion for basketball and golf and enjoys playing either whenever possible.
Peter H. Chang, D.O.
Pediatric Cardiologist
Non-Invasive Imaging, Fetal Cardiology
Dr. Chang joined the Pediatric Cardiology Center of Oregon as a pediatric cardiologist in July 2006. Dr. Chang returns to the Northwest after receiving his medical degree at Nova-Southeastern College of Osteopathic Medicine in Ft. Lauderdale, Florida. He completed his pediatric residency training at University of Maryland, Baltimore. He continued his sub-specialty training in pediatric cardiology at the University of Rochester's Golisano Children’s Hospital at Strong. His research interests have included the role of dystrophin in Duchenne muscular dystrophy, with publications investigating the accuracy of point of care testing devices.
Dr. Chang has developed expertise in non-interventional imaging, specializing in transthoracic and transesophageal echocardiography with a special interest in fetal echocardiography.
Dr. Chang grew up in the Northwest and earned his undergraduate degree in Molecular Biology at the University of Washington. He and his wife, Stephanie, have three boys who enjoy all of the outdoor activities that the Portland area has to offer. He is especially fond of the wide variety of ethnic foods available and the cultural diversity of the city. He is fluent in Korean and enjoys golf, volleyball, soccer, but most of all playing with his kids.
Dr. Margie “Niki” Tucker M.D.
Pediatric Cardiologist
General Cardiology
Dr. Margie “Niki” Tucker joined the Pediatric Cardiology Center of Oregon in the spring of 2020. She earned a Bachelor of Science in biology and received her medical degree at the University of Louisville. She completed her pediatrics residency at Norton Children’s Hospital in Louisville, Kentucky. From there, she traveled to St. Louis where she completed her pediatric cardiology fellowship at Washington University at St. Louis Children’s Hospital. Prior to joining Pediatric Cardiology Center of Oregon, she practiced general pediatric cardiology at Peyton Manning Children’s Hospital where she was awarded the Outstanding Teacher of the Year and named one of the top pediatric cardiologists in Indianapolis.
As a fellow, she developed an interest in echocardiography including transthoracic, transesophageal and fetal echocardiography. Dr. Tucker enjoys caring for patients and their families in both the hospital and office setting and makes it her goal to help families become experts on their child’s heart condition.
She is excited to explore her new home in the Pacific Northwest and all the opportunities it provides. She loves spending time outside hiking, rock climbing and SCUBA diving.
Alisha Floyd, M.D.
Pediatric Cardiologist
General Cardiology
Dr. Floyd joined Pediatric Cardiology Center of Oregon in December 2018. She attended college at Northwestern University where she studied anthropology and Michigan State University where she earned her MD. A southern California native, Dr. Floyd completed her residency training at Children’s Hospital in Orange County California. After practicing general pediatrics for three years, she went on to complete her pediatric cardiology fellowship at the University of Utah/Primary Children’s Hospital.
Dr. Floyd enjoys providing general cardiology care for children and adolescents in an outpatient setting. She is especially proud to work with the underserved and has a passion for improving access for care for all patients with heart disease. When she’s not caring for patients, Dr. Floyd spends her time traveling, dancing in Zumba classes, trying new foods, and learning new languages. She is fluent in Spanish and is currently learning German. Dr. Floyd is excited about living in Portland and all of the adventures to come.
Marc D. LeGras, M.D.
Retired Pediatric Cardiology
Retired
Dr. Marc LeGras retired from the Pediatric Cardiology Center of Oregon on September 30, 2025, after nearly three decades of patient care. Originally from Canada, where he completed most of his medical training, Dr. LeGras moved to Portland in 1996. He joined what was then known as the Children’s Cardiac Center of Oregon—now the Pediatric Cardiology Center of Oregon. Soon after arriving, he established the center’s electrophysiology program at Legacy Emanuel Hospital. That program has since grown into a robust pediatric and adult service. Over the years, he also served in leadership roles including Medical Director of pediatric cardiology at the hospital and President of the practice.
Throughout his career in Portland, Dr. LeGras specialized in the diagnosis and management of heart rhythm disorders. His clinical work included electrophysiology studies, ablation procedures, and the implantation and follow-up of pacemakers and defibrillators. He also cared for patients with inherited arrhythmia syndromes and for children recovering from heart surgery in the pediatric intensive care unit at Randall Children’s Hospital.
Dr. LeGras plans to remain in the Portland area and looks forward to spending more time on the golf course and enjoying other favorite activities like pickleball, cycling, swimming, hiking, and working out. Retirement will also allow him to pursue hobbies long set aside during his medical career. He continues to be active in his church community, remaining committed to service through medical volunteering and participating in medical missions.
The relationships he built with patients and their families were among the most meaningful and rewarding aspects of his career. Although he has stepped away from the day-to-day work of medicine, Dr. LeGras carries with him the lasting memories of the children, families, and colleagues who enriched his journey—and whose lives he was privileged to touch.
Douglas King, MD (Retired)
Retired Pediatric Cardiologist
Retired
Dr. King attended the University of Washington, obtaining both his B.S. and M.D. degrees. His pediatrics residency was at the University of California, Irvine, and was followed by a three-year pediatric cardiology fellowship at Baylor College of Medicine in Texas. Dr. King is board certified in both pediatrics and pediatric cardiology. His special interests are in echocardiography and fetal echocardiography. He and his wife, Carole, have three children.