Jonathan Spollen (28), a freelance writer and journalist from Ranelagh, has not been seen or heard from since February 3rd.
It is thought he may have been planning on going a trek at the time of his disappearance having changed his mind about a trip to Delhi to meet up with a friend.
Mr Spollen had arrived in India from Nepal in late November and was planning to leave the country by February 21st, when his visa was due to expire.
His father David Green has travelled to India to join in the search for him.
Mr Spollen’s mother, who last spoke to him on the day he went missing, said it was completely out of character for Jonathan to be out of contact with her for so long.
“Jonathan has lived overseas for a number of years and has always been good at keeping in touch,” said Lynda Spollen.
“We are 75 per cent confident that he may still be in the Rishikesh area and we don’t think he has left the country.”
Ms Spollen said that friends who had seen Jonathan shortly before he went missing had commented on the fact that he had lost weight.
“Jonathan was planning to come to Ireland before his visa expired and when I was last speaking to him had said he might take a trek before he left. Our concern is that he may have picked up a virus of some kind while trekking because he maybe wasn’t as fit as he thought he was. We are worried that something may have befallen him.”
Ms Spollen said her son would have been determined to leave India before his visa expired.
“Originally, Jonathan wanted to stay in the country for a while and travel from the south to the north but was only able to obtain a three-month visa. However, as a journalist the last thing he would have wanted to do was to overstay in the country because he wouldn’t have wanted blots on his copybook. His intention would always have been to try and get out in time rather than overstay,” she said.
“Jonathan hadn’t been home since April last and so the idea was to head home and be here in Ireland for a while and then see what he would do next,” she added.
Anyone with possible information regarding Jonathan is asked to contact Ms Spollen at email@example.com