Sidney Mathias (District 20)

Sidney Mathias

Lake County Board Member

Mail: 18 North County Street, 10th Floor, Waukegan, IL 60085
Office phone: 847-377-2300
Board member Mathias represents Lake County Buffalo Grove, portions of Long Grove and portions of the unincorporated areas of Vernon and Ela Townships. He was appointed to the board in 2014 to fill a vacancy. Member Mathias is a former state representative and Village of Buffalo Grove Village President, and a retired attorney. His priorities include the extension of IL Route 53 into Lake County, transportation, economic development and job creation, fiscal responsibility, and innovative, transparent, and efficient government management.

Elected Office

  • Lake County Board Member (2014 - Present)
  • Lake County Forest Preserve Commissioner (2014 - Present)
  • State Representative, 53rd District (1999 -2013)
  • Village of Buffalo Grove President (1991 - 1999)
  • Village of Buffalo Grove Trustee (1988 - 1991)

Other Public Service

  • Former Member IL Route 53/120 Blue Ribbon Advisory Council
  • Former member, Buffalo Grove Zoning Board of Appeals (1983 - 1988)
  • Former Vice-Chair of the CATS Council of Mayors
  • Former President of the Northwest Suburban Municipal Conference
  • Former officer for the Lake County Municipal League
  • Former Chairman, North Central Service (Metra) Mayoral Task Force
  • Former Lake County Commissioner, Northeastern Illinois Planning Commission

Civic & Community Service

  • Board Member, Jewish Federation of Metropolitan Chicago
  • Member, Illinois Child Support Advisory Committee
  • Commissioner, Illinois Holocaust and Genocide Commission
  • Former Board Member, Buffalo Grove Chapter of the American Cancer Society
  • Executive Vice-President, Congregation Beth Judea


  • Bachelor of Science in Math, Roosevelt University
  • J.D. Law, DePaul University, College of Law

Personal & Other Information

  • Married to Rita for 44 years
  • Two children, seven grandchildren
  • Buffalo Grove resident since 1979

Lake County Committees


  • Ad Hoc Legislative Committee, Co-Chair
  • Ethics and Oversight, Vice-Chair
  • Planning, Building and Zoning
  • Public Works and Transportation
  • Ad Hoc Government Reform Implementation Committee


  • Law and Judicial
  • Revenue, Records and Legislation, Vice-Chair

Forest Preserve District Committees


  • Diversity & Cultural Awareness, Chair
  • Planning Committee, Vice-Chair
  • Rules Committee