Bartłomiej Szabat acts as a prokurent (a type of a representative) of Mt.Gox in case you're interested:

https://www.facebook.com/bartlomiej.szabat

date of birth: 24/09/1981

edit: btw, this is a sp. z o.o. (a Polish equivalent of LLC) with a minimum capital required by law, so you you will only be able to recover 5000 zł from them (that's about ~1650 USD at current exchange rates). If you want to recover more than that, then you will need to go after MT.GOX CO.LTD.