Neill Reagan is the son of Irish born Irene O'Conner and Irish-American, Jerry Reagan. He began dancing at the age of five when his parents wanted their five children to carry on their Irish heritage. After dancing for only one year, Neill won the title of Eastern Regional Champion and accomplished that same title for the next fifteen consecutive years. At age 7, Neill, his two older brothers and two younger sisters began to tour the states with The Paddy Noonan Show band as the "Reagan Family Dancers".

In 1985, Neill won the prestigious North American Senior Belt and was the youngest dancer ever to accomplish this achievement. Overseas, he won the triple crown Sligo County Championship against the best Europe had to offer, and the All Ireland Championship in Limerick, Ireland. In 1986, Neill became one of only five Americans to earn the title of "World Champion" along with the renowned Michael Flatley.

Neill has continued to perform world-wide with artists such as, The Chieftains, The Wolftones, the Irish Rovers, Jurys Cabaret, The Commitments, and many others. Famous stages include Radio City Music Hall, Trump Plaza, and Resorts International.

Neill now resides in San Antonio, Texas. He is the former proprietor of O'Neills Irish Pub and Restaurant, and owns O'Neills Catering facility in the Southbank area of downtown San Antonio. Neill teaches the Inishfree School of Irish Dancing to keep the tradition alive in Texas.