ArcCells株式会社一級建築士事務所

Hiroyuki Nishioka　(CEO)

Certified Construction Manager (CCMJ)
First-class Certified Architect
First-class Construction Management engineer
Chief concrete engineer
CFT construction management engineer

After completing a master’s degree in Structural Engineering at Tokyo University of Science, he joined Takenaka Corporation.
Throughout his career, he has been engaged in the full life cycle of building projects, including structural design, construction, production design, research, and project and construction management.

In the early stage of his career, he worked at the Osaka Head Office on technically demanding projects such as a suspension-structure arcade and buildings employing top-down construction methods on soft ground. Through these experiences, he developed a deep understanding of how technical concepts are translated into built reality by bridging design and construction.

He later conducted research in geotechnical engineering and underground structures at the Technical Research Institute before transferring to the Kobe Branch.
Following the Great Hanshin-Awaji Earthquake in 1995, during which he was personally affected, he participated in numerous reconstruction projects, including hospitals and urban redevelopment. This period reinforced his awareness of architecture as social infrastructure and the responsibility inherent in architectural decision-making.

From the 2000s onward, he was involved in international projects, including serving as section construction manager for the new construction of Terminal 3 at a major international airport in the Philippines.
At the Osaka Head Office, he later served as Manager and Deputy General Manager, overseeing construction management and production planning for projects in western Japan and overseas, including China and Southeast Asia. He led the on-site implementation of advanced technologies such as seismic isolation systems, top-down construction methods, BIM, and innovative demolition techniques.

From 2013, he was responsible for construction management within the OMRON Group, while also engaging in facility management and acquiring fundamental knowledge of building operation and asset management.
He subsequently worked at an international real estate company, where he handled project management and construction management for domestic and overseas clients, participating in projects from a comprehensive perspective encompassing clients, designers, contractors, and operators.

Integrating these experiences, he founded ArcCells Architects & Engineers Inc. in 2017.
Since 2023, he has partnered with an Italian construction management firm and has been responsible for the detailed design and construction management of five overseas pavilions for Expo 2025 Osaka, Kansai. Through this work, he has established practical professional networks with overseas architects, construction managers, and clients.

In addition to his professional practice, he has served as a part-time lecturer at the Faculty of Engineering, Nara Women’s University since 2025, engaging in education and contributing to the development of future engineers while moving between professional practice and academia.

Masami Nakagawa　(Director)

Certified Construction Manager (CCMJ)
First-class Certified Architect
First-class Certified Construction Manager
Condominium Maintenance Repair Engineer
Welfare and Habitat Coordinator

1990　　　　　　Graduated from Kyoto University

　　　　　　　　・Cooperative housing design
　　　　　　　　・Office relocation support
　　　　　　　　・Planning permission applications for office buildings.

2005 - 2012 　 　Construction Management Company
　　　　　　　　Was mainly in charge of architectural design and construction supervision for medical and welfare facilities.Interested in 　　　　　　　　the building management field.
　　　　　　　　As construction manager, was responsible for supporting clients through the entire chain of business, fromhelp selecting 　　　　　　　　designers, design editing, help selecting constructors through to construction supervision.

2012～　 　　　　Began architectural consulting activity

2014　　　　   　 Mansion Support Net (Nonprofit Organization)
　　　　　　　　 As renovation manager, in charge of building degradation investigations, repair planning, constructor                                       hiringsupport and construction supervision on large scale condominium repair projects.

2017～　　　　　Serving as a construction manager alongside CEO Hiroyuki Nishioka at a foreign real estate investmentcompany.

Teruaki Takagi　Director (Management & Engineering)

Building Mechanical and Electrical Engineer
Sanitary Engineering Health Manager
First-class certified Construction Management Engineer
First-class certified Pipe Construction Management Engineer
First-class certified Electrical Construction Management 　 Engineer

1976　　　　　　Graduated from Nagoya University School of Mechanical Engineering

1976〜1981　　　Toyo Thermal Engineering Corporation
　　　　　　　　Responsible for projects such as the development of NEDO’s large-scale solar heating and cooling systemand                          air conditioning design from the office to the hospital and clean-room.

1981〜2009　　IBM Japan

　　　　　　　　Involved with contamination control of the semiconductor plant
　　　　　　　　In charge of project management of new facilities as well as production line set up at semiconductor, display, etc.factories

2000～2009　　At IBM’s real-estate and construction arm, involved in the consolidation of offices and data centers nationwide.

2009〜2019　　  Omron Corporation
　　　　　　　  As building equipment and utilities head within the Omron Group, in charge of PM and CM work.
　　　　　　　  Responsible for mid to long-term plant repair plans, diagnosing deterioration of building equipment,                                         promotingenergy
　　　　　　　  saving programs and in-house ESCO business.
　　　　　　　  In charge of Creating a global standards checklist for resident safety, and fire and safety standards for domestic                         plants.

2019～　　　　Participating in technology planning at ArcCells Corp.