Brooke M. Thomson, most recently Vice President of Government Affairs for AT&T and a former senior official with the Massachusetts Attorney General’s office, will become Executive Vice President of Government Affairs at Associated Industries of Massachusetts, the association announced today.

Thomson is no stranger to AIM. She has served as a member of the AIM Board of Directors and Executive Committee and chaired the board’s Government Affairs Committee for the past year. She replaces John Regan, who took over as President and Chief Executive Officer of the 3,500-member business association in May.

“Brooke Thomson will allow AIM to move forward without missing a beat on critical upcoming debates on transportation, health-care costs and education funding. She brings unparalleled intelligence and experience to the complex issues that AIM tackles every day on behalf of Massachusetts employers,” Regan said.

Joanne Hilferty, President and Chief Executive Officer of Morgan Memorial Goodwill Industries in Boston and Chair of the AIM Board of Directors added: “Brooke understands both government affairs and the broader mission of AIM as an association of forward-thinking employers working to make Massachusetts a better place for everyone by empowering success and creating change.”

Thomson joined AT&T in 2013. Her duties for the telecommunications company include legislative and regulatory affairs in both Massachusetts and Rhode Island.

Thomson came to AT&T after six years in the Massachusetts Attorney General’s office, where she served as Chief of the Business, Technology and Economic Development Division. Prior to that, she worked as legal counsel to the Massachusetts Legislature’s Committee on Telecommunications, Utilities and Energy.

Her political experience includes managing the successful campaign of Martha Coakley for attorney general in 2010.

“I am thrilled to be joining AIM, the leading voice for businesses for 104 years. I look forward to working with the outstanding AIM government affairs team to ensure that the organization remains a champion of business in the state as we continue to move Massachusetts forward,” Thomson said.

She begins her new job on September 23.

Thomson is a graduate of Northeastern University School of Law and Mount Holyoke College.