You can check the agency at POEA if it is accredited to this office. If the agency is accredited, you can still check it at POEA office if the agency have job orders in Wanik Hospital. It is in the 2nd floor (mezzanine) of POEA if you want to check.
By the way, how did you meet Mark? Why he is recruiting you if he is not the owner of the agency? Is he just referred you to agency? Be careful of scammers they are evrywhere
Please visit POEA website
http://www.poea.gov.ph/