Our History

A History Of Forward Thinking


  • Oliver Wyman acquires Innopay, a leading consultancy firm specialized in digital transactions.
  • Oliver Wyman acquires SeaTec Consulting, a leading provider of consulting and engineering services to the aviation industry.


  • Oliver Wyman opens a new office in Manama.
  • Oliver Wyman opens a new office in Bangkok.


  • Oliver Wyman opens new offices in Abu Dhabi, Brussels, Ottawa, Perth, and Vienna.
  • Oliver Wyman acquires Avascent, an Aerospace and Defense (A&D) management consulting firm.
  • Oliver Wyman acquires Booz Allen Hamilton’s strategy consulting business serving the Middle East and North Africa.
  • Oliver Wyman, as part of Marsh McLennan, announces its commitment to chart a path to net-zero across its operations by 2050 and reduce its emissions by 50 percent by 2030.
  • Oliver Wyman acquires Azure Consulting, a premium boutique management consulting firm in Australia.


  • Oliver Wyman acquires Huron’s global life sciences strategy consulting practice.
  • Nick Studer is appointed as President and CEO of the Oliver Wyman Group and Deputy Chairman of Marsh McLennan.
  • Opening of new offices in Raleigh and Melbourne.


  • Oliver Wyman becomes certified as a Carbon Neutral® company and sets in motion a long-term strategy to integrate sustainability into its operations and reduce emissions.
  • Oliver Wyman opens a new office in Johannesburg.


  • Oliver Wyman launches the Oliver Wyman Forum, a platform that strives to bring together business, public policy, and social enterprise leaders to help solve the world’s toughest problems.


  • Oliver Wyman acquires The Draw Group, a digital transformation agency, based in the UK.
  • Oliver Wyman acquires design thinking consultancy 8works


  • Oliver Wyman acquires AVISA, a UK based global market leader in aviation consultancy, training and airworthiness management.


  • Oliver Wyman acquires LShift, an independent software development company with offices in the UK and Germany.


  • Oliver Wyman acquires TeamSAI, an aviation consulting company with expertise in technical consulting, safety management and aircraft certification.
  • Oliver Wyman acquires the business that formerly operated as OC&C Greater China, a management consulting firm focused on Retail and Consumer Goods sectors.


  • Oliver Wyman acquires Bonfire, an employee engagement and internal communications agency.
  • Oliver Wyman acquires the business that formerly operated as OC&C Boston, a boutique management consulting firm with strong capabilities in business media, information services, and education.


  • Oliver Wyman acquires Corven, a boutique management consulting firm focused on Energy.


  • Oliver Wyman unifies its global capabilities under a single operating model, integrating its industry practices closer together with the launch of five firmwide capability practices, known as "Horizontals."


  • Oliver Wyman acquires ChapterHouse.
  • Oliver Wyman acquires Academee (United Kingdom).
  • Oliver Wyman acquires Hemeria (France).
  • Oliver Wyman acquires Celent.
  • Oliver Wyman acquires Harbour Consulting.


  • Oliver Wyman officially launches as a unified brand and world-class management consulting firm, leveraging the united power of Mercer Oliver Wyman, Mercer Management Consulting, and Mercer Delta Organizational Consulting.
  • Mercer MC acquires CAVOK International, Inc. (US).


  • Mercer MC acquires DiamondCluster International's Continental Europe, Middle East, and South America operations.
  • Mercer MC acquires MultiModal Applied Systems (US).


  • Mercer Oliver Wyman forms its Strategic IT practice and a Corporate Risk Consulting group, including practice areas in Enterprise Risk, Actuarial, and Strategic Finance.


  • Mercer Delta acquires CDR International, LLC (US).
  • Mercer MC acquires c.r.m. Concord, s.a. (Spain).


  • Mercer Oliver Wyman formed, following the acquisition of Oliver, Wyman & Company by Marsh & McLennan Companies, Inc.


  • Mercer Delta acquires Change Management Consultants (France).
  • Mercer Delta acquires Johnston Smith International, Inc. (Canada).
  • Mercer MC acquires Informed Sources Holdings Ltd. (UK and US).
  • Oliver, Wyman & Company acquires Intervaluenet (Italy).


  • Delta Consulting Group acquired by Marsh & McLennan Companies, Inc.
  • Mercer MC acquires Análisis y Desarrollo de Proyectos (Mexico).
  • Mercer MC acquires St. Gallen Consulting Group (Germany and Switzerland).


  • Mercer MC acquires Dr. Seebauer & Partner GmbH (Germany and Switzerland).
  • Oliver, Wyman & Company acquires Higginson & Partners (UK).


  • Mercer MC acquires Corporate Decisions, Inc. (US, UK, France).


  • Oliver, Wyman & Company establishes presence in the Pacific Rim.
  • Mercer MC acquires MID S.A. (France).


  • Mercer MC acquires Unternehmensberatung Munchen GmbH (Germany and Switzerland).


  • Temple, Barker & Sloane / Strategic Planning Associates name changed to Mercer Management Consulting, Inc.


  • Merger of Temple, Barker & Sloane and Strategic Planning Associates.
  • Strategic Planning Associates acquired by Marsh & McLennan Companies, Inc.
  • Oliver, Wyman & Company creates a dedicated risk management practice that helps transform how financial institutions and major corporations manage risk.


  • Oliver, Wyman & Company initiates expansion outside of the US with office openings in London and Toronto.


  • Temple, Barker & Sloane acquired by Marsh & McLennan Companies, Inc.


  • William M. Mercer acquires Duncan C. Fraser & Co and Future Cost Analysts, forming the initial basis of Oliver Wyman's Risk Finance and Insurance operations.


  • Oliver, Wyman & Company founded in New York.


  • Delta Consulting Group founded in New York.


  • Strategic Planning Associates, Inc. founded in Washington, D.C.


  • Temple, Barker & Sloane, Inc. founded in Boston.


  • NERA Economic Consulting, Inc., or National Economic Research Associates, founded.


  • American brand strategy and design firm Lippincott founded in New York City.