Mr Lethbridge, with his family, runs Werrington Cattle Company, a commercial beef cattle, breeding, growing, and fattening enterprise. Werrington has been in the Lethbridge family for 124 years with the curent branch of the family in ownership since 1980. The Werrington business runs over 13,000 head of cattle and comprises a breeding program on 120,000ha of natural eucalypt forest country, approximately 250km west of Townsville and 200km north of Hughenden in North Queensland. The business also consists of Rainmore Station, a 27,000ha property near Alpha in Central Queensland.

Mr Lethbridge has a deep understanding of cattle production systems, managing breeder and feeder cattle under extreme environmental conditions and pasture nutrition levels, utilising genetic selection and strategic herd management to achieve production and business success.

Mr Lethbridge has a Dip Rural Business Management, Cert Animal Husbandry and Farm Engineering (Hons), GAICD.

Mr Lethbridge is a director of Meat & Livestock Australia Limited, Integrity Systems Company Limited and a member of the Audit, Finance and Risk Committee. Previously, Mr Lethbridge was Chair of the Hann Highway Action Group, a member of the Rural Fire Board and a member of the Oak Park Race Club Committee. He was an elected representative of AgForce for seven years, beginning as Regional Vice President for the North Region, then as Regional President and Board Member and member of AgForce Finance Audit and Risk and Agribusiness Finance Drought and Climate Policy Committees. He was a member of the steering committee for the Northern Gulf Resource Management Group to develop and promote a business improvement package for North Australian cattlemen. Russell has been a director on the MLA board since 2017.