Equiom's global CEO, Sheila Dean, said: "This is an exciting appointment for Equiom that supports the group's strategy to actively develop its e-business service line.
“Peter is an expert in his field, having worked with some of the world's leading businesses in the industry during his impressive career.
Greenhill added: “Equiom is a forward-thinking, fast-paced business with ambitious plans for its e-business service line.
“I’m looking forward to joining the team to bring Equiom to the forefront of this competitive industry.”