Tony Egan has been missing from his home in Portarlington since September 19 this year - he was last seen by his flat mate at 8:30pm that evening.
And his mum, Bridget, has issued an emotional plea on Crimecall in a desperate attempt to find him.
The 34-year-old had spoken to his mum on September 19 and arranged to meet up in Wexford the following day. However, he failed to show up and his wallet, mobile and laptop were all found in his apartment.
// Crimecall // Tonight the mother of 34 year old Tony Egan is appealing for your help to find him... RTÉ One 9.35pm pic.twitter.com/FPbghWmtnJ— RTE One (@RTEOne) December 19, 2016
"The two of us were very close - he always used to ring me every day or I would ring him," Bridget said.
"He used to say: "When you are an old lady or really old I will look after you, mammy."
Along with extensive searches in Ireland, Gardaí are working with Greater London Police - it is believed Tony had connections in London - and Interpol.
"We have been searching - I went to Dublin and put up loads of posters myself and my daughter. I hope something will trigger off something. I just want Tony back."
Tony is described as being 5 foot 11 inches tall, with brown hair and a slim build; he was last seen wearing a black hooded top with black tracksuit bottoms and white runners.
Anyone with information is asked to contact Portarlington Garda Station (057) 8623112 or any garda station.