Here my professional contact information:
The preferred way of contacting me directly is by email:
If it is really urgent, call me on my cell. Choose the one closest to you.
- DE: +49 (157) 8153 4150
- US: +1 (650) 450 8550
Depending on my timezone, I may not be able to pick up the phone in time.

Hi! My name is Daniel, I’m from St. Petersburg, Russia. We have a group of people here who would really like to go to Silicon Valley for two weeks or more. The only problem is that we don’t know anybody there and are not exactly sure about the places and the program we’d like to have.
I wondered if you still provide the tours mentioned on website and if you do maybe we could cooperate and talk everything through before we come to the US.
If you are interested please contact me.
Hi Daniel, I’ve left the Silicon Valley, so I can’t serve as a guide, sorry! I’ve told a friend about your request who might approach you then. Enjoy your trip! –Dirk
Hi Dr. Dirk Riehle,
I was wondering if you are interested to become my first supervisor.
Do you accept international students for Phd ?
My research area is related to open source ERP project management.
Regards,
Mohammad