She replaces Claire Tuffin, who has been handed a wider remit as MD of VMA Group.
Walter will now oversee a team of consultants focusing on permanent and interim recruitment in the in-house arena.
Walter commented: ‘We are seeing many "green shoots" in the corporate comms space as companies' budgets are freed up. It is my aim to continue to grow and develop our business to ensure we are the consultancy of choice in corporate communications.'
Crystal has seven years' experience in the recruitment sector. Prior to VMA she worked for international law firm, Lovells.
Fiona Bradshaw remains as head of corporate for VMA Search.