Brook has worked for Ashfield for more than 15 years in various roles in operations, account management and business development. She has worked as head of engagement since 2012, and since her appointment the team has grown from six to 21 full-time employees and seen a number of new business wins.
Brook said: "I am thrilled to take on the mantle of engagement director. With a number of new staff appointments over the past year and a number of new business wins to kick start 2015, it is an exciting time for the team.
"I am looking forward to leading further growth over the coming months and working closely with our agile consultancy resource Spark Thinking, which is aimed at enhancing the effectiveness of live events and communication strategies."
Global managing director at Ashfield Nicola Burns said she looked forward to the "continued growth" of the company’s engagement services under Brook’s leadership.
"Jo has been working closely with the management team to develop our engagement offering to a market-leading position," she said.
"As a result, our clients are now regularly utilising our tools, services and consultancy to deliver more effective messaging and create continuous conversations beyond set event dates."
In 2014, Ashfield increased staff numbers in the wake of new business wins and contract renewals, and relocated to support growth of the agency.
The company also launched its new partner brand, Spark Thinking, to offer a consultancy resource designed to enhance the effectiveness of Ashfield's live events and communication strategies with 'edgier, more interesting and exploratory options'.