Johan de Flines was born on 8 July 1965 in the Netherlands.
He graduated in Law at the Erasmus University of Rotterdam in 1990. He has been registered as a lawyer with the Bar of Rotterdam (“Advocaat”) from 1993 to 2018 and with the Bar of Milan since 1996, first as a 'Registered Foreign Lawyer' and since 2006 as a lawyer (“Avvocato”).