The Yamaguchi Consulting team.

Our Team

Meet our partner consultants. While each consultant operates their own office independently, we work as a unified team, coordinating our efforts to provide comprehensive services to our clients.

Yoshio Yamaguchi, CEO & Principal Consultant, Yamaguchi Consulting

Yoshio Yamaguchi

CEO & Principal Consultant

Background

Yoshio graduated from Waseda University and began his career at The Long-Term Credit Bank of Japan (now Shinsei Bank). Following the bank's nationalization, he became a certified public accountant, joining Azusa Audit Corporation, where he specialized in financial and internal control audits. He later moved to Deloitte Tohmatsu Tax Co., handling M&A tax restructuring, tax due diligence, and tax accounting services for international clients.

In 2019, Yoshio founded Yamaguchi Consulting to support foreign individuals, foreign-owned companies, Japanese firms expanding abroad, and international corporations. His expertise includes management visa acquisition and company establishment support.

Qualifications

  • Certified Public Accountant, Licensed Tax Accountant

Professional Affiliations

  • Tokyo Tax Accountant Association (Registration No. 142583)
  • Japanese Institute of Certified Public Accountants (Registration No. 26311)
  • Tokyo Administrative Scrivener Association (Registration No. 20081822)

Contact

Email: yamaguchi@yconsulting.co.jp 

Atsuoki Hoshiyama, Consultant, Yamaguchi Consulting

Atsuoki Hoshiyama

Consultant

Background

Atsuoki earned his Certified Public Accountant license and began his career with Arthur Andersen, conducting financial audits. He then joined a multinational corporation, managing a wide range of back-office functions for foreign clients, including accounting, tax, budget management, payroll, and social insurance. Fluent in English, Atsuoki has expertise in international ERP systems such as SAP and Oracle and significant experience in global tax matters.

In 2013, he became CFO and Director of Finance at a public service provider, overseeing investor relations, cash management, and business planning. He established the Hoshiyama Tax Office in 2019 to provide accounting and financial statement services to foreign-owned companies. Leveraging his English fluency and international tax expertise, Atsuoki partnered with Yamaguchi Consulting, focusing on accounting and tax filing for foreign companies and leading personal income tax services for international clients.

Key Accomplishments

Corporate Management
  • CFO and Director of Finance, responsible for board financial reporting, investor relations, and cash management
  • Oversaw medium-term business planning initiatives
Accounting & Tax
  • Led accounting and tax departments across multiple organizations
  • Spearheaded new accounting system implementations
Corporate Restructuring
  • Directed finance efforts in post-merger integration (PMI) and corporate division projects

Qualifications

  • Certified Public Accountant, Licensed Tax Accountant

Professional Affiliations

  • Kanto-Shinetsu Tax Accountant Association (Registration No. 140356)
  • Japanese Institute of Certified Public Accountants (Registration No. 032571)

Contact

Akira Baba, Consultant, Yamaguchi Consulting

Akira Baba

Consultant

Background

With nearly 20 years in customer service at a mobile phone retailer, Akira built strong connections across a diverse customer base through attentive communication. While working, he qualified as a certified administrative scrivener and established the Baba Akira Administrative Scrivener Office in 2023. Drawing on his customer service expertise,

Akira now supports clients in various administrative tasks, focusing on visa acquisition for foreign nationals and services related to inheritance, wills, and end-of-life planning for senior clients. After founding his office, he networked extensively with local professionals—including lawyers, tax accountants, and judicial scriveners—ultimately forming a partnership with Yamaguchi Consulting. Akira assists Yamaguchi's clients with visa acquisition and company establishment support.

Qualification

  • Certified Administrative Scrivener

Office

  • Baba Akira Administrative Scrivener Office

Professional Affiliations

  • Administrative Scrivener Association (Registration No. 23131827)

Contact

Naoko Sato, Assistant, Yamaguchi Consulting

Naoko Sato

Naoko began her career in corporate administration before studying in Canada, where she learned fundamentals in tourism, architecture, CAD, and accounting. Returning to Japan, she joined World Telecom (then the second-largest telecom company in the US), working in sales administration and CAD operations. Later, she took a break to focus on family and subsequently joined Yamaguchi Consulting, where she supports VAT filing services for foreign clients.

Noriko Terauchi, Assistant, Yamaguchi Consulting

Noriko Terauchi

Assistant

Holding a registered dietitian license, Noriko started her career in specific health guidance before shifting her focus to family life. She later joined Yamaguchi Consulting, assisting with various administrative tasks related to accounting and tax services.