I want to know the answer to the following question:
What nationality was de Courtenay?
All the background I'm provided with is that "The Polish scholar Jan Baudouin de Courtenay (together with his former student Mikołaj Kruszewski) introduced the concept of the phoneme in 1876, and his work, though often unacknowledged, is considered to be the starting point of modern phonology.". Is that enough to answer the question?
Answer: yes