My father was a dentist and he taught me that Ambrose Pare was the father dentistry. 
That is great.  Are you a dentist?
In the process of becoming, currently a student in dentistry college. 
Good luck to you.  I work in sales of enterprise software.
Thank you and how do you like selling enterprise software ?
I like it a lot.  I used implement it and worked long hours.  Now I sell it and a little tougher to sell high dollar software, but I enjoy it and its less hours.
That's good to hear, is the software you sell open source, which is open technology under standard commercial terms and support is valuable.
Good question...no it is not, or I would make no money selling free software.  Haha.  It's patented proprietary software. 
I see, but I heard Microsoft was going open source or maybe they changed their business. 
For some products.  But not for operating system or enterprise software.