Leaving the S-Bahn stop "Dortmund Universität" you go up the large stair and walk next to the library heading towards the refectory, a large orange building. You pass the refectory on the left and cross the "Martin-Schmeißer-Platz" with its fountain. Walking up another large stair and going 50 meters you will see a large cogwheel. The Building directly behind this cogwheel is the Buidling G2, where you find us in the third floor.
Starting at the southside of the campus you will reach the chair with a trip in the elevated railway, called the "H-Bahn". The Station "Campus Nord" will end up directly in front of the refectory. Just turn to the left and follow the instructions above.