Our Team – Olla Business Advisory

MEET OUR TEAM

GARETH LEONG

C.E.O

About the C.E.O - GARETH LEONG

Gareth has over 20 years of diversified experience providing taxation and business advisory services to clients in various industries ranging from manufacturing, trading, e-commerce etc.

Gareth is a Fellow Member of ACCA, Member of Chartered Tax Institute of Malaysia (CTIM), Member of the Malaysian Institute of Accountants (MIA) and a member of Asean Chartered Professional Accountant (ACPACC). He is a licensed tax agent and GST agent approved by the Ministry of Finance (MoF).

Prior to settling in Malaysia, Gareth has extensive experience in the field of accounts and tax in the United Kingdom (UK) and undertook several projects, that has accumulated to his working knowledge and exposure.

Gareth has been engaged in variety of projects that ranges from business restructuring, advisory and planning. He is also engaged in providing direct and indirect tax services such as compliance, tax advisory and transfer pricing.

Currently, Gareth is the C.E.O of OLLA, a director of Taxguards Advisory Sdn. Bhd. and he also acts as the Chief Executive Officer of CAS International Network Limited.

WINSON OOI

Deputy C.E.O

About the Deputy C.E.O - WINSON OOI

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Winson is an accomplished professional with a distinguished academic and professional background. He has earned the prestigious title of Fellow Member of Association of Chartered Certified Accountant (ACCA) and is a fellow member of the Chartered Tax Institute of Malaysia (CTIM), as well as a Chartered Accountant of the Malaysia Institute of Accountants (MIA).

With a comprehensive knowledge base encompassing auditing, accounting, management consultancy and tax advisory. Winson has extensive experience includes financial management, tax planning, budgetary control and office administration.

Notably, Winson served as the Group Finance and Administrative Manager for a market leading company engaged in diverse business activities; ranging from timber export, sawmill, logging, property development, construction, to hotel operations and management.

Currently, he is Deputy C.E.O of OLLA, a director of Taxguards Advisory Sdn. Bhd. and he heads the Kuantan office of GC PLT.

ANG ZHI JIAN

Executive Director

About the Executive Director - ANG ZHI JIAN

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Zhi Jian is a finance and audit professional with a wealth of experience, holding the esteemed Fellow Member of Association of Chartered Certified Accountant (ACCA) and being a Member of the Malaysian Institute of Accountants (MIA).

With more than ten-years experience in various fields, including audit and assurance, business advisory, corporate governance, financial & cost accounting, initial public offering exercise, merger and acquisition. He was a manager of a mid-tier audit firm and group accounts manager of a leading premium marble company.

Zhi Jian is also the founder of ZJA Business Advisory, showcasing his entrepreneurial spirit and expertise in providing strategic financial solutions.

ANNIE TAN

Regional Office Director

About the Regional Office Director - ANNIE TAN

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Annie is a skilled individual, with two decades of valuable experience in the field of accounting, taxation, company secretarial and consultancy.

She is also a member of the Malaysia Institute of Accountants (MIA), the Chartered Tax Institute of Malaysia (CTIM), the Chartered Institute of Management Accountants (CIMA), and the Chartered Global Management Accountants (CGMA).

In addition, she has worked for a multinational manufacturing company. Her role in the commerce industry as a financial assistant has provided her with invaluable insights into corporate operations.

By also working with one of the biggest four accounting firms, this has equipped her with a robust skill set and a deep understanding of the financial industry.

PHILIP YONG

Regional Office Director

About the Regional Office Director - PHILIP YONG

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Philip has more than 20 years of experience in the fields of audit & assurance, taxation and business advisory for various types of companies and businesses. He is a member of Malaysian Institute of Accountants, Chartered Tax Institute of Malaysia, Certified Practising Accountants of Australia and Asean Chartered Professional Accountants.

He started his professional career with one of the Big 4 accounting firms for a period of 5 years and subsequently worked in the commercial arena for another 8 years before founded his own accounting firm in 2004 acting as a licensed Tax Agent and an approved Company Auditor. With exposures on both sides of the table as a business executive as well as a public accountant, he is well poised to help and advise clients in their demanding business environment.

DANIEL CHONG

Accounting Standard specialist

About the Accounting Standard specialist - DANIEL CHONG

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Daniel is a Chartered Accountant with over a decade of experience in auditing, accounting, and corporate secretarial services across various industries. He began his career in an accounting firm, where he gained hands-on experience in audit and advisory services, helping businesses navigate financial reporting and compliance requirements.

As a member of the Malaysian Institute of Accountants (MIA) and CPA Australia, Daniel is committed to upholding high standards of professionalism and financial integrity. He is also a Approved Company Auditor and Company Secretary, specializing in regulatory compliance, corporate governance, and financial management. His expertise enables him to provide businesses with practical solutions that enhance operational efficiency and ensure adherence to statutory requirements.

VH CHU

Senior Tax Consultant

About the Senior Tax Consultant - VH CHU

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Chu has more than 30 years of experience dealing with personal tax compliance, corporate tax services, dispute resolution, and special tax commissioner cases involving tax audits and investigations, corporate tax planning and advisory, statutory audits, internal audits, financial due diligence, and listing assignment with the initial 15 years attached to Ernst & Young. He is a member of the CTIM, MIA, MICPA and IIAM.

Chu is currently the Chairman of CTIM Sabah Branch. He is the Tax Director of V Tax Services Sdn. Bhd., and he is also practicing as an Auditor under V.H.Chu & Associates.

YC YAU

Forensic Specialist

About the Forensic Specialist - YC YAU

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Yau holds degrees in both law and accounting from the University of Malaya and Universiti Tunku Abdul Rahman, respectively, and is currently pursuing a Master’s in Commercial Law to integrate his expertise in both fields to better assist clients.

With extensive experience across various industries—including MNCs, government-linked companies, SMEs, and publicly listed firms—he has worked with clients in construction, property development, healthcare, manufacturing, oil & gas, telecommunications, and more. He has led audits for Malaysian-listed companies and managed a portfolio of over 200 SME clients.

Beyond audit and assurance, Yau specializes in fraud investigations, US FCPA/UK ABAC compliance reviews, digital forensics, financial due diligence, forensic data analytics, and agreed-upon procedures (AUP) engagements, both locally and internationally. Previously, he was part of the Fraud Investigation & Dispute Services division at Ernst & Young and contributed to SAP implementation at a multinational e-commerce retailer.

Yau founded YC Yau & Co. in 2019 after obtaining his audit license from Malaysia’s Ministry of Finance.