About

Who We Are

Established in 1930, the R. M. Towill Corporation (RMTC) is one of the oldest and largest kama’aina engineering firms in Hawaii. The firm provides integrated professional services in civil engineering, wastewater engineering, surveying and mapping, planning and permitting, and construction management. Since its inception, the company has completed over 20,000 projects in Hawaii and throughout the Pacific Basin.

We strive to exceed our clients' expectations and make a positive impact on the communities we serve.

Our History

In 1930, Mr. Roswell M. Towill entered private practice as R. M. Towill Engineer and Surveyor, with the intent of providing surveying and engineering services to government agencies and private clients throughout the Hawaiian Islands. As his practice grew, Mr. Towill added photogrammetry in 1947 to complement his surveying and engineering services. On July 1, 1954, Mr. Towill's private practice was incorporated as R. M. Towill Corporation, Ltd. On July 1, 1970, the name of R. M. Towill Corporation, Ltd. was formally changed to Kilohana Corporation and a new company, R. M. Towill Corporation (RMTC), was formed.

This new company became the first subsidiary of the Kilohana Corporation. By then RMTC had grown to include Planning, Environmental Engineering, and Construction Management disciplines as well to become one of Hawaii's first consultancies to offer such a comprehensive and vertically integrated suite of services. RMTC went on to deliver such exciting and award-winning projects as the Honoulu International Airport Reef Runway, Sand Island Wastewater Treatment Plant, the Hawaii Ocean Science and Technology Park, West Loch Estates and Fairways, Ewa Villages Revitalization, Palau Compact Road, and many others.

Today, the diversity of our staff of licensed professional engineers, planners, environmental scientists, surveyors, certified construction managers, and large technical pool provide RMTC with the flexibility to assign qualified personnel to projects of all sizes and degrees of complexity.

Our Mission

To provide innovative and sustainable solutions to meet the unique challenges of our island communities.

Years of Service
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In 1930, Roswell M. Towill opened his engineering and surveying practice in the Territory of Hawaii.  It was a time of great advances in the major industries that would shape Hawaii’s future – air transportation, communication, agriculture, and defense.

Completed Projects
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Since its inception, RMTC has completed over 20,000 projects in Hawaii and throughout the Pacific Basin.

Licensed Engineers
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Our licensed engineers are experts in civil, water and wastewater engineering and have decades of experience in their respective fields.

LEED Accredited Professionals
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With an emphasis on sustainable design, we strive to design projects that are not only functional but also respect the environments where they are built.

Employees
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RMTC is a 100% employee-owned company with a staff of 120 Hawaii residents who are committed both professionally and personally to the community in which they work and live.

Leadership

rmtc (2)

RMTC is led by a senior management staff with an average of 35 years of professional experience. These discipline leaders have extensive technical backgrounds, as well as many years of experience in project management and contract administration. They serve as industry experts and mentors to staff internally as well as external to the firm in various professional and community organizations. With their many years of service in Hawaii and the Pacific, they are often able to assist clients and projects by fostering productive agency consultation and agreements by leveraging their understanding of government priorities, protocol, and requirements. They are well-respected members of Hawaii’s engineering community and highly knowledgeable about the unique issues affecting our island state.

Greg Hiyakumoto
PE, LEED AP, ENV SP

President
Greg has spent his entire career at RMTC and assumed the role of President in October 2012. He is responsible for establishing an overall direction and overseeing performance of the firm’s Civil Engineering, Wastewater, Planning, Surveying, and Construction Management practices. Throughout his career at RMTC, Greg has served in various technical and managerial capacities, most recently as the head of the Civil Engineering Department, the firm’s largest practice in both staff and billings.

Collins Lam, PE

Vice President / Department Manager, Civil Engineering
Throughout his professional career, Collins has held progressively responsible positions as a designer, project leader, and department manager. He currently heads RMTC’s Civil Engineering Department and serves as technical advisor for the firm’s Water and Wastewater Engineering practice. Collins is a former appointee to the City and County of Honolulu’s Department of Design and Construction. As Deputy Director, and later Director, he oversaw the department’s Capital Improvement Program.

David Tanoue, Esq.

Vice President / Manager, Surveying & Mapping and Planning Departments
David contributes decades of professional experience with an emphasis on land use and development planning. As former Director of the City and County of Honolulu's Department of Planning and Permitting, David possesses an intimate knowledge of legislative, regulatory, and agency processes and perspectives. David leads RMTC's Planning & Permitting and Surveying & Mapping Departments and serves as an advisor to all departments on planning and permitting issues.

James Yamamoto, PE

Vice President / Senior Project Manager
Jimmy has spent his entire career at RMTC and serves as technical expert and quality control manager on many of the firm’s projects. He has been involved in a broad range of projects including drainage, sewer, and water plans; drainage designs; new development and redevelopment master plans; flood analyses, and transportation projects. He is known throughout the State for his expertise in hydraulic engineering, watershed management, and water source development. Jimmy frequently provides interagency consultation for projects requiring agreements on technical and institutional issues.

Craig Luke, PE

Vice President / Senior Project Manager
Craig has a comprehensive civil engineering background. As Senior Project Manager, he has been responsible for the design of highways and roadways, site development, and infrastructure including water, sewer, drainage, subdivisions, resorts, and airfields. Craig has spent his entire career with RMTC where he has led the design for major infrastructure and sitework projects of varying size and complexity.

Kyle Yukumoto, PE

Vice President / Department Manager, Water & Wastewater Department
Kyle has spent his entire career at RMTC and is currently the Department Manager for the firm’s Water and Wastewater Engineering department, which specializes in wastewater conveyance, collection, and treatment. His experience encompasses both mechanical and civil design work on wastewater and water treatment facilities. He has designed process mechanical, pump stations, grading, piping, and civil site work. He has also completed cesspool conversion studies and projects on Oahu, Maui, Kauai, and Hawaii, featuring either septic tanks, leach fields or converted seepage pits.

Michael Inouye

Secretary / Department Manager, Construction Management
Mike has over 37 years of project management and construction management experience, specializing in airport-related construction. He has also managed numerous projects involving site preparation, roadway modifications, pavement repair, infrastructure improvements, building improvements, wastewater treatment facilities, roof rehabilitation, and electrical upgrades. In 2022, Mike became manager of the firm’s Construction Management Department.

Jon Yamanishi

Treasurer/Controller
Jon is a Certified Public Accountant with over 35 years of combined work experience in individual and corporate taxation, and hospitality and real estate accounting. In his current role as Controller, Jon manages the day-to-day accounting and tax compliance functions for RMTC and its parent company and investment subsidiaries.

Our Recent Project Awards

  • Honouliuli Wastewater Treatment Secondary Treatment Phase 1B
    2024 Building Industry Hawaii’s Top 3 Infrastructure Projects
  • Kaipapaʻu Stream Bridge Replacement
    2024 Building Industry Hawaii’s Top 3 Infrastructure Projects
  • Gentry Kalaeloa Parcel 1 Phase 2
    2024 Building Industry Hawaii’s Top 3 Infrastructure Projects
  • Lilia Waikiki
    2024 AIA Honolulu Award of Merit
    2022 ENR California Best Projects
  • Kapalama Container Terminal Yard Design
    2023 ACECH Grand Conceptor Award
  • Ala Wai Canal Dredging and Improvements – Dredging Work, Oahu
    2022 GCA Hawaii Build Hawaii Awards –  Award of Excellence 
  • F-22 Fighter Alert Facility at Joint Base Pearl Harbor Hickam
    2022 GCA Hawaii Build Hawaii Awards – Award of Excellence 
  • Ala Moana Wastewater Pump Station Improvements
    2022 GCA Hawaii Build Hawaii Awards – Award of Excellence 
  • Mauka Concourse at Daniel K. Inouye International Airport Expand
    2022 GCA Hawaii Build Hawaii Awards – Award of Excellence 
  • Moanalua High School Performing Arts Center
    2021 AIA Honolulu People’s Choice
    2021 NAIOP Hawaii Chapter Distinguished Entry
    2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
  • UH-West Oahu’s Creative Media Academy
    2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
  • North Shore Bridges – Kawela and Nanahu
    GCA Hawaii Build Hawaii Awards – Award of Excellence
  • Kapalama Container Terminal 
    2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
  • Interstate Route H-1 Shoulder Work and PCC Pavement Rehabilitation
    2020 ACECH Excellence Award
  • Diamond Head Apron Reconstruction Gates G1 to G6
    2020 GCA Hawaii – Build Hawaii Awards – Award of Excellence
  • The Ritz-Carlton Residences at Waikiki Beach
    2020 BIA Hawaii – Multifamily Development – Average Unit Price More than $800,001 
  • Central Maui Regional Sports Complex
    2019 ACECH Honor Award
  • Kapolei Business Park Wastewater Pump Station
  • 2019 ACECH Honor Award 
  • UH West O‘ahu, Administration + Health Sciences Building
    2019 AIA Honolulu Award of Excellence & Mayor’s Choice Award
  • Hoakalei Golf Course Clubhouse
    2019 AIA Honolulu Hawaii Energy Award
    2019 BIA Hawaii Overall Grand Winner
  • The Ritz-Carlton Residences, Waikiki Beach, Phase 1 and 2
    2019 GCA Hawaii Build Hawaii Awards  Award of Excellence 
  • Queen Kaahumanu Highway Widening, Phase 2 CM
    2019 GCA Hawaii Build Hawaii Awards Award of Excellence 
  • Moanalua Hillside Apartments Phase 1
    2019 GCA Hawaii Build Hawaii Awards Merit Award
  • Taxiway Z Structural Improvement, Honolulu International Airport
    2018 ACECH Honor Award 
  • Hickam Federal Credit Union
    2018 BIA Hawaii Grand Award: Details Commercial
  • Kapalama Container Terminal Yard Design
    2023 ACECH Grand Conceptor Award
  • Ala Wai Canal Dredging and Improvements – Dredging Work, Oahu
    2022 GCA Hawaii Build Hawaii Awards –  Award of Excellence 
  • F-22 Fighter Alert Facility at Joint Base Pearl Harbor Hickam
    2022 GCA Hawaii Build Hawaii Awards – Award of Excellence 
  • Ala Moana Wastewater Pump Station Improvements
    2022 GCA Hawaii Build Hawaii Awards – Award of Excellence 
  • Mauka Concourse at Daniel K. Inouye International Airport Expand
    2022 GCA Hawaii Build Hawaii Awards – Award of Excellence 
  • Moanalua High School Performing Arts Center
    2021 AIA Honolulu People’s Choice
    2021 NAIOP Hawaii Chapter Distinguished Entry
    2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
  • UH-West Oahu’s Creative Media Academy
    2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
  • North Shore Bridges – Kawela and Nanahu
    GCA Hawaii Build Hawaii Awards – Award of Excellence
  • Kapalama Container Terminal 
    2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
  • Interstate Route H-1 Shoulder Work and PCC Pavement Rehabilitation
    2020 ACECH Excellence Award
  • Diamond Head Apron Reconstruction Gates G1 to G6
    2020 GCA Hawaii – Build Hawaii Awards – Award of Excellence
  • The Ritz-Carlton Residences at Waikiki Beach
    2020 BIA Hawaii – Multifamily Development – Average Unit Price More than $800,001 
  • Central Maui Regional Sports Complex
    2019 ACECH Honor Award
  • Kapolei Business Park Wastewater Pump Station
    2019 ACECH Honor Award 
  • UH West O‘ahu, Administration + Health Sciences Building
    2019 AIA Honolulu Award of Excellence & Mayor’s Choice Award
  • Hoakalei Golf Course Clubhouse
    2019 AIA Honolulu Hawaii Energy Award
    2019 BIA Hawaii Overall Grand Winner
  • The Ritz-Carlton Residences, Waikiki Beach, Phase 1 and 2
    2019 GCA Hawaii Build Hawaii Awards  Award of Excellence 
  • Queen Kaahumanu Highway Widening, Phase 2 CM
    2019 GCA Hawaii Build Hawaii Awards Award of Excellence 
  • Moanalua Hillside Apartments Phase 1
    2019 GCA Hawaii Build Hawaii Awards Merit Award
  • Taxiway Z Structural Improvement, Honolulu International Airport
    2018 ACECH Honor Award 
  • Hickam Federal Credit Union
    2018 BIA Hawaii Grand Award: Details Commercial
Ala Wai Canal Dredging and Improvements – Dredging Work, 2022 GCA Hawaii Build Hawaii Awards – Award of Excellence
Mauka Concourse at Daniel K. Inouye International Airport Expand 2022 GCA Hawaii Build Hawaii Awards – Award of Excellence
Moanalua High School Performing Arts Center, 2021 AIA Honolulu People’s Choice & NAIOP Hawaii Chapter Distinguished Entry
UH-West Oahu’s Creative Media Academy 2021 GCA Hawaii Build Hawaii Awards – Award of Excellence
The Ritz-Carlton Residences at Waikiki Beach 2020 BIA Hawaii – Multifamily Development – Average Unit Price More than $800,001
Hoakalei Golf Course Clubhouse, 2019 AIA Honolulu Hawaii Energy Award & BIA Hawaii Overall Grand Winner
Central Maui Regional Sports Complex, 2019 ACECH Honor Award
Kapolei Business Park Wastewater Pump Station, 2019 ACECH Honor Award

Serving Hawaii Since 1930

Learn about the full suite of multidisciplinary services that are offered by R.M. Towill Corporation.

Our Services

Get in Touch with Us

Don't hesitate to contact us today and let us help bring your engineering vision to life.
Contact Us

Oahu:
2024 North King Street, Suite 200
Honolulu, HI 96819-3494
Tel: 808-842-1133
Fax: 808-842-1937

Hawaii Island:
73-5574 Maiau Street, Suite 11
Kailua-Kona, HI 96740
Tel: 808-329-4494

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