Not sure about that. A personal and professional account does seem like a good idea. Users are allowed multiple accounts, but only one 'free' one. If you want a second account, you would need to use a service like SteemConnect and pay the account creation fee for the new account (currently 15 STEEM). Below is a link with instructions in case you want to go that route.
RE: You should join Steemit. Here is why.