The long-awaited announcement comes four months after former managing director Kevin Duffy quit the broker in order to head up Robert Sterling.
Cornell has long been mooted as Duffy’s successor but Hamptons has taken its time to confirm the appointment.
Cornell will take on the role with immediate effect and will focus on growing the division as part of Hamptons’ wider strategic expansion plan.
Cornell joined Hamptons in 2002 and for the last 4 years has played a central role in driving the business and its profitability forward.
Hamptons UK residential agency managing director Mark Anderson says: “The Mortgages division is a key part of Hamptons’ structure and strategy – committed to providing premier property finance and advice solutions to its clients and investors in the UK and overseas.
“Jonathan has made an outstanding contribution to the success of the Hamptons International’s Mortgages division over the years and has more than earned the opportunity to support and grow the business further.