Based in the firm's Adelaide office, McCarthy has progressed through the ranks after starting as a summer clerk.

She provides advice to employers in relation to all aspects of industrial relations and employment law including occupational health and safety and discrimination.

"Erin has been one of the firm's up and coming talent for many years," said managing partner Tony Phelps. "This promotion has been well earned."

Piper Alderman has also appointed four senior associates and eight associates nationally.