Mid-sized Australian firms Thomsons Lawyers and Herbert Geer have announced plans to merge.

The combination will become effective March 31, with the resulting firm to be known as Thomson Geer. It will have about 310 lawyers, including 81 partners, in offices in Sydney, Melbourne, Brisbane and Adelaide.

In a statement, the two firms said that the combination will strengthen their practices in mergers and acquisitions, construction, employment, real estate, intellectual property, finance, and insurance. The firms are also looking to expand into other parts of Australia, particularly Perth.

Current Thomsons chief executive partner Adrian Tembel will take on the same role at Thomson Geer. Herbert Geer managing partner John Cain will serve as partner in charge of integration.

Herbert Geer’s Sydney and Brisbane lawyers will relocate to Thomsons’ offices in those cities. For the time being, combined firm will continue to operate out of two offices in Melbourne.

Some lawyers have left, or are planning to do so, as a result of the merger. In November, Herbert Geer lost its 13-lawyer planning, government, infrastructure and environment team to Colin Biggers & Paisley. At the same time, Thomsons’ workers compensation practice is leaving to set up its own shop as a result of a conflicts issue.

One more Sydney-based practice team is expected announce its departure soon as well.

Email: tbrennan@alm.com.