Practice Areas


  • University of California, Los Angeles School of Law, J.D.

  • University of Notre Dame, B.A., Government and International Relations and English, cum laude

State Bar Admissions

  • California

Federal and Patent Bar Admissions

  • U.S. District Court for the Central District of California

Timothy B. McOsker

Partner and Co-Chair of the Government & Regulatory Law Department
t:  310.556.7870
f:  213.620.5749
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Timothy B. McOsker, who has vast experience in governmental, regulatory and administrative law, has served as the Chief Deputy City Attorney for Los Angeles and as the Chief of Staff to Los Angeles Mayor Jim Hahn. Mr. McOsker co-chairs Glaser Weil’s 10-member Government and Regulatory Practice from the Firm’s Downtown Los Angeles branch office.

Mr. McOsker was a Partner at Glaser Weil from 2005 until 2008, when he left to practice at a prominent global firm. For more than 30 years, Mr. McOsker’s career has focused on legislative and regulatory matters for both public and private clients, including in the areas of land use, environmental, permits, contracts and related issues before local, regional and state governmental agencies.

In addition to a variety of civic, philanthropic and community leadership roles, Mr. McOsker previously served on a three-member governing board, having been appointed by Gov. Jerry Brown, that was responsible for dissolving the Community Redevelopment Agency of Los Angeles.

Mr. McOsker has extensive experience representing public agencies and, more recently, private entities before state and local government . He handles all aspects of land development, and  in matters of government contracting, permitting, licensing and public-private partnerships.

As Mayor Hahn’s Chief of Staff, Mr. McOsker managed the day-to-day operations of the Mayor’s office and implemented policy initiatives in cooperation with the departments, commissions and officers of the City on behalf of the Mayor. Before serving as Chief of Staff, Mr. McOsker was the Chief Deputy City Attorney for the City of Los Angeles, where he managed the operations of that office on behalf of the elected City Attorney and oversaw the advice and representation of all the departments, commissions and officers of the City. Earlier in his career, Mr. McOsker was in private practice as a partner and manager at a municipal law firm, during which he served as city attorney for several California municipalities.

  • University of California, Los Angeles School of Law, J.D.

  • University of Notre Dame, B.A., Government and International Relations and English, cum laude

  • California

  • U.S. District Court for the Central District of California

  • Represented a charitable, nonprofit hospital system on the expansion of its facilities throughout Southern California, including entitlements and development of a campus expansion and several medical office buildings and related facilities.

  • Advised and represented significant landowners on multiple projects, most recently, an office developer on the entitlements for a state of the art, LEED-certified tower.

  • Advocated before a port authority, secured the approvals and negotiated the terms for a relocation and extension of a major terminal facility, including the land use, environmental and lease terms of the deal.

  • Navigated the process before a water and power agency and a related joint powers authority for a solar farm and water storage and regeneration project in California, including the power purchase and interconnection agreements.

  • Researched, advised, advocated for and expedited permits through a municipal utility and several city departments for an innovative fuel cell company that develops distributed generation facilities on private office and industrial properties.

  • Represented both the challengers and defenders of several RFP award protests at multiple agencies, including in the substantive areas of concessions, advertising, co-generation facilities and other services for which the government will contract.

  • Chairman, San Pedro Chamber of Commerce

  • Immediate Past Chair and Officer, Central City Association, Los Angeles

  • Trustee, Providence Little Company of Mary Foundation

  • Former Member of the CRA/LA Designated Local Authority

  • Former Trustee, Port of Los Angeles Charter High School

  • School Board Member, Holy Trinity Elementary School

  • Past member, Development Committee, Cathedral of Our Lady of the Angels, Los Angeles

  • Past President of the City Attorney’s Association of Los Angeles County, 1998

  • Member of the Appointed Charter Revision Commission, Los Angeles, 1997

  • Past contributor to the League of California Cities Municipal Law Handbook