Arriving by Car
If you come from the east from the A40 (former A430), take the exit "Essen-Frillendorf" then proceed along Frillendorfer Strasse till the second traffic lights appear. Turn right into Burggrafenstrasse, then at the second traffic lights turn left into Gerlingstrasse. After the second traffic lights you arrive at Schützenbahn 70 (block tower and the old building).
If you come from the west from the A40 you can already leave the motorway at exit "Zentrum" or "Huttrop" and follow the signs to Zentrum/Universitaet. If you arrive from the A52 from Duesseldorf please take the exit "Essen-Sued" and follow the signs to the University of Essen (not Universitaetsklinikum). After passing the very high administrational building your destination is on the right side.
Arriving by Public Transportation
Starting central station of Essen you can take the tram 107 with destination "Gelsenkirchen Hbf" or 108 with destination "Essen-Altenessen". Get off the tram at the second stop, called "Viehofer Platz". Take the exit in the direction of the tram's front and turn left. You can alternatively walk here from the central station through the pedestrian precinct. It will take you about 15 minutes. You can also take a look at the transportation map.
Arriving by Plane (at Düsseldorf Airport)
After taking the SkyTrain to the airport station, several trains are going to Essen Hbf, e.g., the S1 line to "Dortmund". From Essen Central Station you can follow the directions for public transportation.