Under EASA regs coming into force in April with an implementation date as yet to be confirmed but not long after you will be required to hold dual licences and medicals in order to operate a non EASA aircraft in EASA territory. This means if you have an FAA PPL and IR you will also need a matching EASA one.
Only if resident in the EU. Ringo is a US citizen spendig time in the CR. Unless his residency moves to the CR, then he will not need to have EASA pilot qualifications.