As part of your application, you are expected to contact a potential host professor and ask them to sign a declaration of commitment. On this form, the professor also has to provide a statement of how the proposed project connects with the their field of research and seek a counter signature from the host project.
When contacting a host, please note that only those professors can be hosts who are conducting full-time research at Freie Universität Berlin.
Please understand that you are expected to independently find a host professor. Use the website of your chosen host project to identify suitable professors to contact.