I'm planning to start my master thesis soon. It will be an external thesis in a company.
As this kind of thesis is not very common in German universities, I need to find a professor to supervise me during the whole semester.
Luckily, a professor agreed to supervise me and advised me to meet with one of his PhD students to discuss my task, whether it meets all requirements.
We met the following day. Afterwards, I sent my professor an email to arrange a meeting to clarify some things and get his final OK.
As he hadn't responded for about a week, I sent a reminder. This time he answered, we met and discussed more things. He even suggested to call my boss to clarify my task, so that I don't need to "liaise" between them.
After talking to my boss, I sent my professor another email with times, my boss is available for the call.
This email remained unanswered for another week, as well. I wasn't sure how to react, so I contacted my professor's secretary. She told me to send him another reminder, also she would talk to him.
He answered me a few days later and promised, to call my boss during the following 2 days.
Unfortunately, he didn't.
I'm in an awkward situation now. My boss asks me regularly about my professor, because I can't officially start my thesis before we have his OK. I'm waiting for about a month now.
The phone call between them wouldn't last more than 10 minutes and all the little issues about my thesis would be resolved. His secretary said, this behaviour is very uncommon. Also, I never had any problems with this particular professor.