I hear the question is natural hair professional? pop up a lot and I wanted to add my two cents =). I have to wake up at 5:30am to go to work (puke, I know) and I am just about awake enough to make myself look appropriate for outdoor viewing. Therefore, I have to keep my styles nice and simple. I currently do two braids at the front and put the rest into a low bun; this means I can do it the night before! My hair is neat and ready to go in the morning.
As to whether natural hair is professional, the short answer is yes! Natural hair is not a ‘hairstyle’ it is the hair that grows out of my head so why shouldn't I wear it to work? As for hairstyles, there are professional and non professional styles, but this applies to all hair, not just natural hair. Hair should be styled appropriately for the job and the situation. So you might not want go to work with your hair like this!
If you have never worn your natural hair to work, it may feel like a big step initially, but give yourself a 'Take Your Hair to Work Day" and see how you feel – you might surprise yourself.