Areas of work: He is one of the most influential
analysts of the twentieth century and has made significant contributions
to Harmonic Analysis. He has been active in the fields of mathematical
education and its development. Pier has also done research in
the evolution and development of mathematics during the twentieth
century
Publications and positions held: He has edited
two collective volumes entitled "Development of Mathematics".
Among the books he has written is "Mathematical Analysis
during the 20th Century". As the President of the Luxembourg
Mathematical Society, he was instrumental in putting forward
the motion proclaiming the year 2000 as the "World Mathematical
Year" by UNESCO, via the Luxembourg government