From: Sean Peterson
Date: February 24, 2012
Subject: [subject of memo]
I would like to all join me in welcoming [name of new joiner] who [job position]. [previous background]
[Any more additional information.]
I would like to request all of you to please introduce yourselves to [First name] and make [him/her] feel welcome at XYZ Company.
For any more help, please do not hesitate to contact me.