I have been seeing Dr. Zenner for about half a year. If you are trying to find a new psychiatrist, I highly recommend going elsewhere. I can't speak much to his personal ethics, as I really don't know him. He seems like a decent guy. His professionalism, however, is insulting and unapologetically so.
I make appointments usually three months in advance, by necessity to get an appointment. They do not provide any kind of email reminder service, even upon request. They do call you the day before. They won't call you any further in advance than that. If the voicemail doesn't work for whatever reason for the receptionist, she is not going to try again. Of course if you miss the appointment, or are late, you have to pay something along the lines of $200 (fairly typical policy for missing appointments in the industry, but their reminder 'service' really sets you up for failure.) Even so, it really is your own responsibility to keep track of your own appointment, so not horrible on their part, but certainly inconvenient, as well as unconventionally unhelpful.
Every single appointment I have had, I was kept waiting for at least a half hour. At first, I thought, 'ok. This doc has some patients who have just had the proverbial poop hit the fan, and has to extend the sessions.' People have bad days, and I know I have been in situations where my therapy appointments ended at times when 5 minutes more would have made a huge difference to my functionality for the next few weeks. We are all human, and if my waiting an extra 5-10 minutes means someone can get through their week, it didn't seem like the worst policy.
However, waiting a minimum of a half hour, sometimes exceeding an hour, proves to me that while he is more than happy to charge you for his time whether you make your appointment or not, your time is completely worthless to him. Maybe a half hour isn't a huge amount of time, but if you are working a low paying hourly wage job, trying to pay rent, that missed time at work adds up very quickly into you not being able to pay for things like food or rent.
One day, I had the first appointment of the day. I got there on time. The receptionist was unfriendly and without a good morning, said, 'that's x dollars' as if I were buying a hot dog. Admittedly, I was not uber friendly either. I wasn't rude, but I also wasn't being paid to be there.
Dr. Zenner had his door open and was talking with someone. It clearly was not an appointment. He was really just shooting the shit. Half hour into my appointment time, a guy with a nice suit and briefcase walked out of Dr. Zenner's office. Dr. Zenner walked him up to the receptionist desk and they had some friendly goodbye words.
He then called me in. There was no apology for the wait time. No real explanation. He mentioned he volunteers his time on Tuesdays and Thursdays (it was a Thursday). I think volunteering is great. But for someone to volunteer my time without my permission, during my scheduled appointment, especially when I was paying a lot of money to be there as well as not being paid because I could have been missing work (it was a weekday), that is excessively rude. There is no excuse for that. None. And it wasn't just me! Within that half hour, two more patients came in and sat down, waiting for their appointment. None of them mentioned anything to the receptionist about being early.
I have been seeing psychiatrists for over 20 years. I have had plenty of experience in seeing what is out there, what a good psych is and does, and what a poor excuse for one does. Dr. Zenner is not evil, but he is offering a business that completely abuses you of your time and does not make up for it in any kind of special psychiatric skill. He has not offered any real psychiatric help to me that I think any other psychiatrist would be able to offer ( i.e. maintaining a treatment plan developed by another psychiatrist). Like everyone, I have problems, and I have found Dr. Zenner to be of no real help in getting insight into defining them, or finding their solutions. There are better psychiatrists out there. Much better. Find them instead.