Dr. Culligan was born and raised on the lakeshore, growing up in Manitowoc and returning to practice in the town he loves. After graduating from Roncalli High School in 1996, he continued his education at Marquette University, graduating with a B.S. in biology. During a one-year break from school, he worked as a dental assistant to help confirm dentistry was the career he wanted to pursue. Dr. Culligan graduated in 2005 from Creighton University School of Dentistry in Omaha, Nebraska before returning to his hometown.

Dr. Culligan is an active member of St. Francis of Assisi parish and has served on numerous boards and in roles such as the Pastoral Council, SFA School Board, and Roncalli Catholic Schools Board of Trustees. He is also involved in the Cedar Lake Improvement Association, having served as the secretary and now currently the Vice President.

Dr. Culligan is a member of the Manitowoc/Calumet County Dental Society, the Wisconsin Dental Association, and the American Dental Association. He donates his time and services at the Lakeshore Technical College dental clinic working with the dental assisting students and providing dental care to those in need.

Marrying his high school sweetheart, Stacey, and returning home, he is blessed to have three beautiful girls, Lindsey, Claire, and Elise. Together they enjoy spending time with family, traveling, and relaxing at their cottage on Cedar Lake. He loves to play golf (when he has free time) and is an avid Wisconsin and Marquette sports fan. Now instead of playing sports, Dr. Culligan enjoys cheering his girls on during their sporting events.