I searched him in google and found couple of sites with some info about him:
You must login or register to view this content. - This is his personal page, witch does not show much info about him. Mostly about the two games he script (MW1 and MW2)
You must login or register to view this content. - This link you will find developers of MW1. He is in that list as an Design and Scripting.
And that vid, is not the only:
[ame="
https://www.youtube.com/watch?v=6cO1NjERjEg&feature=player_embedded"]YouTube- MW2: Afgan & Highrise - "Alexander Roycewicz 2009" Easter Eggs!!![/ame]
[ame="
https://www.youtube.com/watch?v=_MY_qMUgO9s&feature=player_embedded"]YouTube- MW2: Quarry - "Alexander Roycewicz 2009" Easter Egg![/ame]
What people are saying, is that he is know to add his name in maps...