Jaak Peetre (29 July 1935, in Tallinn – 1 April 2019, in Lund) was an Estonian-born Swedish mathematician.
Bernard Malgrange,[2] Jacques-Louis Lions,[4] and Peetre were pioneers of modern interpolation theory.
[5] He gave lectures at more than 30 international mathematical congresses and conferences and in many cases was among the organizers.
In 1998 he was awarded the Royal Society of Sciences in Uppsala's Celsius Gold Medal.
[1] Jaak Peetre was the most prolific Estonian mathematician of his era, often visiting Estonia and giving lectures there.