The agency, formed in October 2010 by the merger of Mandate, Hogarth and Penrose Financial, will work across the company's investment and M&A businesses. Gay Collins, executive chairman of MHP, will lead the investment account, while MHP directors Lucinda Kemeny and Martin Forrest will head the M&A team.
MHP will primarily be responsible for media outreach in the UK, but the remit also includes pan-European trade and specialist investment and financial media.
One of the key aspects of the brief is to promote the regular research Towers Watson compiles on the M&A market along with Cass Businesses School.
Penrose Financial previously worked with Watson Wyatt before the company merged with Towers Perrin in January 2010 to create Towers Watson.
There was no incumbent on the account and MHP was appointed without a competitive pitch. The firm uses a number of other agencies globally, including Ketchum in the US.
The agency will report to Paul Deane-Williams, head of PR at Towers Watson EMEA.