| 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.