Donnchadha Mac Con Uladh was born on January 24, 1883 in Belfast. According to good friend Ronan Maguire, Dennis and Daniel are both acceptable translations of the Irish name, Donnacha (Dunn-ach-a). You may find information regarding McCullough with both Dennis or Daniel as first name.

He was a piano tuner by trade and established a retail business at 12 Howard Street, Belfast in 1909.  Three years later he moved to larger premises at 8 Howard Street where the company started making bagpipes. David Glen (Edinburgh) was said to have been involved, possibly teaching turning skills.  The main turner seemed to be a man called William Andrews, who played both uillean pipes and mouthblown bagpipes. Andrews was also P.M of the pipe band attached to Trinity College, Dublin. He was a prolific writer on the subject of piping, and compiled and wrote the book, "McCullough's Irish Warpipe Tutor & Tune Book", published in 1926. Andrews received his instruction from Pipe Major Willie Gray of the Glasgow Police.
Sometimes, old pipes are found in difficult condition. Careful restoration is often rewarded with an excellent musical instrument and reminder of the past.
D McCullough