she believes her son entered the triglav national park in slovenia for his hike on the morning of june 23 but he has not been seen or in contact with anyone since hiking would be something that he loves to do stone told abc news on the morning of the june 22 stone said she left for the us and luskin was on his way from vienna austria to ljubljana slovenia by train she said he met with the family in europe they are also checking luskins phone cell phone records and whatsapp calls the us department of state said it is also working with local authorities to find him he has an amex card here in the states and there have been no activities on either one she said referring to an abbreviation of american express susan stone police are treating the case as highprofile and have informed the public about it luskins has been published in every national newspaper the spokesperson added after stone hadnt heard from her son for weeks stone said she decided to report her son missing to us state department senator tammy baldwins office and the us embassies in slovenia croatia and greece on july 20 she said he had planned to continue travel in europe to croatia and greece before heading to japan then back to hong kong in early august i just want him to be okay jonathan reid luskin 25 is pictured in vienna with his mother susan stone in this june 2018 photo jonathan reid luskin 25 is pictured in this undated passport photo we are aware of reports of a us citizen missing in slovenia an official with state department told abc news courtesy susan stone later that day stone said luskin left a message on whatsapp for one of his friends who lives in hong kong saying he had arrived in slovenia and intended to go hiking on the weekend in slovenias triglav national park luskin an american teacher residing in hong kong has been missing since june 23 2018 abc news dragana jovanovic contributed reporting from belgrade serbia and abc news conor finnegan contributed reporting from washington slovenian police were informed on july 25 that a us citizen from wisconsin named jonathan reid luskin was missing a slovenia police spokesperson told abc news confirming that luskin was last seen in vienna on the morning of june 22 when he took the train to ljubljana but there has been no evidence that luskin traveled to any of those destinations stone said luskin had further travel plans after slovenia according to his mother i sent him a message on june 25 that he didnt respond to stone told abc news she said that was the last time she saw her son through interpol slovenian police are cooperating with police in croatia austria greece the us and china the spokesperson added jonathan reid luskin from wisconsin also known as jon is believed to have left austria for slovenia