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Dr. Leffingwell earned his Doctor of Dental Surgery (D.D.S.) with distinction from the University of Oklahoma College of Dentistry. He then entered the United States Navy as a dental officer. Dr. Leffingwell completed a General Practice Residency at Naval Hospital Camp Pendleton Marine Corps Base, California. Following his residency, he was assigned to Fleet Hospital/Naval Hospital in Jacksonville, Florida.
After being honorably discharged from active duty, Dr. Leffingwell earned his specialty certificate in Endodontics from the University of Nebraska Medical Center College of Dentistry.
Lincoln Endodontics began in January 2006 when Dr. Leffingwell purchased the practice of Dr. Merlyn Vogt. Prior to practicing in Lincoln, Dr. Leffingwell practiced in Joplin, Missouri.
He is an active member of numerous professional organizations including the American Association of Endodontists, American Dental Association, Nebraska Endodontic Association, Nebraska Dental Association, the Lincoln District Dental Association, and Delta Sigma Delta.
Dr. Leffingwell is married to Karla Dawn Maddux, formerly of Imperial, Nebraska. She is a Corporate Trainer and College Business Instructor. The Leffingwells are avid outdoorsmen. They also own King Twist Quarter Horses and raise, train, and show American Quarter Horses. They both compete in timed and cutting horse events.