Reporting to Levy, Broadhurst's title will be discipline mentor and his role will be to oversee a number of creative teams and client sectors within the agency's integrated creative department.
The title is equivalent to that of creative director and he will work alongside Brian Storey and Xanthos Christodoulou, who joined from EHS Brann in October.
The appointment is part of Levy's ongoing strategy to create an integrated creative department. Levy began this process when he joined Joshua 16 months ago to reflect the agency's above- and below-the-line capabilities.
Levy said: "Steve's appointment is in the wake of a string of pitch wins. He'll be working across a variety of our integrated and direct marketing accounts. His work is terrific, and we're very excited to have him join the team."
Broadhurst's most recent permanent post was as the creative director of WWAV Rapp Collins between 2000 and 2002. He has since been working as a creative consultant at Craik Jones Watson Mitchell Voelkel on accounts such as Orange, NatWest and Land Rover.
Broadhurst has worked in direct marketing for 18 years. He joined WWAV from its sister agency WWAV Scotland, where he held the position of creative director for three years.
Before that, he was the creative director at TBWA\GGT and was one of the management team that defected to set up Lowe Direct.
Last year, Joshua began bolstering its integrated capabilities, employing more than 30 extra people.