[byoung2]

Using "they" would be grammatically incorrect since the subject is singular. To be politically and grammatically correct I could have gone with "he/she" or "the OP" but statistics and history are on my side with "he" knowing the demographics on this site.

[radq]

"They" can be and is commonly used as a gender-neutral singular.

http://en.wikipedia.org/wiki/Singular_they

[byoung2]

In the acceptability section of that Wikipedia article, most style guides reject singular they usage.