Mark Muller, the 34-year-old head of chambers at 10-11 Gray's Inn Square, has poached nine new tenants for his progressive set.

Muller, thought to be the youngest head of chambers at the Bar, has also poached chambers administrator Conrad Blanchard from Hardwicke Building.

The new arrivals sees the set leap to 31 tenants and Muller says further announcements are imminent. “By the summer the set will be up to 40-strong,” he says.

The set's growing popularity and reputation follows a dramatic shift in emphasis since Muller's appointment in September. Previously known as a common law set, it now has a growing reputation for international law, having created a 12-strong public law and human rights practice, which supplements the existing criminal and civil teams.

The set is run as a limited company, with the five directors and chairman, Muller, controlling financial and administrative management.