Photo of Osamu Kumasaka

Osamu Kumasaka

Junior Associate

Osamu Kumasaka is a Junior Associate at the Consensus Building Institute. He is a trained mediator and facilitator with nonprofit sector experience in energy policy and environmental management. His primary focus is supporting collaboration and consensus-building processes by conducting research and analysis, organizing stakeholders, and synthesizing meetings into reports. 

Areas of Focus

Osamu contributes to CBI’s conflict resolution and capacity-building efforts across a wide range of issues, including land use and transportation, renewable energy and extractives, food and agriculture, climate mitigation and adaptation, and water management. Conveners and stakeholders in this work include nonprofit organizations, businesses, and every scale of government from municipalities to federal agencies. Working predominantly in the Northeast U.S., Osamu is engaged in strengthening collaboration capacity during multi-party processes, as well as within organizations. He supports group work in planning and policy with the background research necessary to form or follow best practices. He also organizes community outreach strategies to engage the public in stakeholder processes. 

Exemplary Projects

  • Climigration Network
  • NY Renewable on the Ground Roundtable
  • MassMoves Statewide Transportation Visioning
  • MA Division of Ecological Resources Strategic Visioning Retreat
  • UN Systems Staff College Consensus Building for Sustainable Development Training
  • First Nations Tax Commission Training 


The following is a partial list of clients:

Federal Agencies

  • Environmental Protection Agency
  • National Parks Service

State Agencies

  • MA Department of Ecological Restoration
  • MA Department of Fish and Wildlife
  • MA Food Policy Council

Local Municipalities

  • City of Cambridge, MA
  • Town of Brewster, MA
  • Village of Piermont, NY

Nonprofit Organizations

  • The Nature Conservancy
  • The Barr Foundation
  • Lincoln Institute of Land Policy
  • Mystic River Watershed Council

Education and Affiliations

Osamu has training in mediation, negotiation, and facilitation of environmental and public processes. He holds a B.A. in Environmental Studies from Lewis & Clark College.