Mountainside Borough Council


Mountainside is governed by a Mayor and Council form of government, as authorized through the Option Municipal Charter Law (Faulkner Act). Enacted by the State Legislature in 1950, this form of local New Jersey government provides for the election of a Mayor for a term of four years and a Borough Council of varied complement. In our case, the Borough Council consists of six members, elected for staggered three year terms. Both the Mayor and Borough Council are elected at-large, that is, to represent the entire community. Elections for all officials in Mountainside are conducted during the November General Election. The Borough Council holds its meetings on the 1st and 3rd Tuesdays of each month at 7:30 pm in Borough Hall. 


  Rene Dierkes

Phone: 908-403-6685


  • Councilman, term expires 12/31/2025
  • 10 years as Councilman
  • Mountainside resident since 1999
  • Portfolio: Fire, Administrative & Executive, Board of Tax Assessors

  Steven Matejek

Phone: 908-341-6958

  • Councilman, term expires 12/31/2026
  • 3 years as Councilman
  • Mountainside resident since 1976
  • Portfolio:  Fire, Police, Recreation, Public Works/Facilities, Board of Education, Senior Citizen Services 

 Donald Rinaldo, Jr.


  • Councilman, term expires 12/31/2024
  • Mountainside resident since 1969
  • Portfolio: Public Works, Fire, Solid Waste/Recycling, Shade Tree, Library, Board of Tax Appeals

 Valerie Wass


  • Councilwoman, term expires 12/31/2024
  • Portfolio: Public Works/Facilities, Solid Waste/Recycling, Rescue Squad, Planning Board, Media & Information, Children's Specialized Hospital  

  Robert W. Messler

Phone: 908-341-6707


  • Councilman, term expires 12/31/2024
  • 20 years as Councilman
  • 1 year as Council President
  • Mountainside resident since 1994
  • Portfolio: Administrative and Executive, Police, Media & Information

  Donna Pacifico

Phone: 908-341-6739

  • Councilwoman, term expires 12/31/2025
  • 4 years as Councilwoman
  • Mountainside resident since 1991
  • Portfolio: Recreation, Board of Health, Police, Solid Waste/Recycling, Administration & Executive, Media & Information, Historical Restoration Committee 

  John N. Post, Esq.

  • Borough Attorney
  • 51 years as Borough Attorney
  • Firm: Post, Polak, Goodsell, & Strauchler, P.A.
  • Mountainside resident since 1972