Yes, He can recover the account, First he can use forget password option see if it helps him. otherwise, if any address is assigned with your profile you can ask Theymos to recover it.
The link to the post of theymos:
https://bitcointalk.org/index.php?topic=497545.0My friend got his bitcointalk account stolen yesterday.
Is there any way he can get it back?

The previous poster is correct about how to possibly recover a hacked account.
You can read more about the process in this thread here:
https://bitcointalk.org/index.php?topic=497545.0Hope that helps your friend recover his account!
Thanks to both of you.
Just have a question, this is quote from the link:
-----BEGIN BITCOIN SIGNED MESSAGE-----
My account has been hacked/lost. Please reset the email to . The current date is .
-----BEGIN SIGNATURE-----
-----END BITCOIN SIGNED MESSAGE-----
Here is the unedited post where I posted that address: ...
OR
I sent that address to someone in a PM with PM ID#...My friend did send PM including his bitcoin address, but since he can't access his account now, how can he find the PM ID#? As you have this account you can send PM to Theymos using this account.
You can just follow the steps shown in the Quote.