All that can presently (May 2013) be gleaned about by internet searching is that McNair-Ilgenfritz is the one-off composer of Original Hesitation Waltz (1914) published by Edward Schuberth & Co., New York, USA.
Surfers are welcome to contribute information about this composer.
This list is arranged in chronological order and contains 1 work by McNair-Ilgenfritz.
It does not claim to be complete and represents only the number of items located. Keys:ER