Two prominent WA women will take positions atop the boards of Infrastructure WA and GESB following John Langoulant's appointment as the state's agent general in the UK and Europe.
Ms Lockwood had served as deputy chair since the body's formation in 2019 and had recently chaired the state government's Westport Taskforce.
In addition, she is also owner and principal of Lockwood Advisory, and has served on the board of several government businesses, including Horizon Power and the Pilbara Development Commission.
Ms Gaines, meanwhile, was Premier Mark McGowan's deputy chief of staff between 2012 and 2021, and had previously spent close to two decades as assistant secretary of the CPSU.
Business News revealed earlier this month that she had formed an advisory business with her sister and prominent non-executive director Alison Gaines, named Gaines Advisory.
Mr McGowan thanked Mr Langoulant for his leadership this afternoon while welcoming the new appointments.
Ms Tomkinson, meanwhile, is currently chief executive of Royal Flying Doctor Service, having served in that role since 2018, as well as chair of the Wheatbelt Development Commission.
Prior to that she served on the boards of the Zoological Parks Authority, Housing Choices Western Australia and Uniting WA.
Infrastructure WA released its draft, 20-year strategy document in July, with improved asset management and planning for an Aboriginal cultural centre among its 88 recommendations.
A final review of the document is due before the document is transmitted to Mr McGowan's office later this year.