|Email:||My user name is johanh and this should be followed by the at sign and then kth.se|
|Office phone:||+46 8 790 66 91|
|Address:||Mathematics KTH, SE-100 44 Stockholm, Sweden|
|Visiting address:||Linstedsvagen 15, floor 6, room 3634|
|Home address:||Karlavägen 28, 5 tr, 114 31 Stockholm|
|Private phone:||+46 70 565 5211|
The safest way to reach me is by email.
I am interested in computation complexity and in particular efficent approximation algoritms and circuit complexity.
I am the chairman for the class of mathematics the Royal Swedish Academy of Sciences.
I am involved in the center for Cyber defense.
I am an editor for the journals Theory of Computing and TheoretiCS.