The head of the firm's litigation and dispute resolution group and infrastructure and dispute resolution division, Guy Humble, will be taking the reins as the new managing partner, effective immediately.

The new structure will see the chairman of partners, Brett Heading, maintain an executive role while handing his operational responsibilities to Humble - to help the firm meet the needs of its growing client base.

"Guy will assume direct partnership management responsibilities, which will allow me to continue as chairman to concentrate on the firm's strategic direction and spend more time on client interaction," said Heading.

As managing partner, Humble will work closely with CEO David Goener who will continue to have responsibility for the firm's day-to-day management.

Humble has a long history with McCullough Robertson, having started his articles at the firm in 1978. He then spent nine years as a partner at Blake Dawson before returning to McCullough in 2005.

According to Humble, his biggest challenge as the new managing partner will be the firm's people.

"As a firm, there's 40-plus partners and we have 400 people on staff [including partners]....so our biggest challenge is our people," he said. "It's important from our perspective to encourage diversity and by doing so, to attract the best and brightest and to keep our people energised."

- Briana Everett