This is actually pretty straightforward... nothing was put into the maze to throw you off.
Just do what makes the most sense as you make your way through the maze.
Pull a lever whenever you pass one. When you do this, you'll shut one gate but open another.
Then, just keep going (usually through the gate you just opened) until you get to another lever.
Note that you'll pass through the place where you started a couple of times, but the gates will be arranged differently, allowing you to leave the lobby in a different direction each time.
Following this method should lead you right into Kaufner's office.

Otherwise, here's the full path you need to take, starting from when you first enter the asylum.
N = North (the direction you're facing when you first enter the asylum)
S = South
E = East
W = West
P = Pull lever

N, W, W, W, S, P, N, W, N, N, N, E, S, P, N, E, E, E, E, E, E, S, P, N, E, S, S, S, W, S, P, N, W, W, W. Now, you should be back in the room you started from, but the doors will be configured differently.

N, N, N, W, W, W, S, P, N, W, S, S, S, E, S, P, N, E, E, E. You're back in the entry, but the doors are in yet another configuration. Now, just go N, N, N, N, N, N. This should put you in his office.