ABOUT US

KAP Gideon Adi & Rekan was established in 2012. Our people have a wide experience in handling various client such as mining, manufacturing, service, IT, etc. In 2016 KAP Gideon Adi & Rekan became a member of MGI Worldwide a leading global network of independent professional accounting and consulting firms. We are now known as MGI Gideon Adi & Rekan.
 
In Indonesia, MGI Worldwide is represented by MGI Gideon Adi & Rekan for consulting and assurance and non-assurance services. The firm has ten partners and about sixty senior and junior staff members The partners and professional staffs are members of the Indonesia Accountant Association and Indonesia Advocate Association. The firm provides auditing and assurance, tax, legal, information technology consultancy, and other related services such as corporate secretarial, financial and commercial advisory. Clientele of the firm ranges from individuals to multi-national corporation and listed companies engaged in various type of business.

 

OUR TEAM

Gideon Adi Siallagan

Gideon Adi Siallagan, received his Master and Bachelor of Science Degree in Accounting from University of Indonesia. Prior establishing KAP Gideon Adi & Rekan Gideon started his career with one of big four accounting firm in 1999. Gideon worked for Asian Development Bank, World Bank, and other NGOs. Gideon has served both public and privately held companies in a variety of industries, including manufacturing, mining, investment, government and nonprofit organizations. Gideon provide audit and assurance services, financial due dilligence services and business advisory service for a wide range of clients.

gideon@mgi-gar.com

   

Ramaida Ritonga

Ramaida received Bachelor of Accounting from University of Indonesia. She got her Certified Public Accountant (CPA) in 1998. She has more than 20 years experience in accounting firm. Her expertise are in auditing of mining sector, financial institution and in auditing of State owned enterprise. Out of auditing, she is also experience in corporate restructuring and merger acquisition process.

ramaida@mgi-gar.com

           

Bisner Sitanggang

Bisner received Bachelor of Accounting from HKBP Nommensen University. He has more than 12 years experience in accounting firms. He is a Chartered Accountant (CA) from The Indonesian Institute of Accountants and Certified Public Accountant of Indonesia (CPA) from Indonesian Institute of Certified Public Accountants.

bisner@mgi-gar.com

   

Jean Baptiste Patoir

Patoir is the firm Foreign Advisor, with more than 25 years of experience, emphasising in Energy, water, infrastructure, mining, etc. He specializes in Project Finance, PPPs, and privatizations. He has worked with IFI, Asia Development Bank in various projects, and other international non government organizations. He has advised international financial institution, concession companies, operators and bidding consortia in infrastructure projects, notably in power generation, transportation, hospitals, energy, water treatment, river basin management, airports and railways.

jbp@mgi-gar.com

           

Valiant Great Ekasaputra

Valiant Great received Bachelor of Accounting from Airlangga University. He got his Certified Public Accountant (CPA) in 2016.
He is a Chartered Accountant (CA) from The Indonesian Institute of Accountants. He has more than 9 years experience in accounting firm.

valiant@mgi-gar.com

   

Joyada Siallagan

Joy, received his Bachelor of Science degree in Taxation from University of Indonesia. Currently he is pursuing his doctoral degree in Bankruptcy Law. Joyada has solid experience in handling corporate tax planning as well as tax dispute. Joyada has appeared before the tax court handling tax disputes. Currently he is pursuing his doctoral degree in Bankruptcy Law. Joyada is a member of Indonesia Tax Lawyer, Advocate Association, and member of administrator bankruptcy.

joyada@mgi-gar.com

           

William Suria Djaja Salim

William received Bachelor of Accounting from Atma Jaya University and Magister of Accounting from Trisakti University. He has more than 12 years experience in Finance, Accounting, Tax and Audit in real sector  and more than 8 years’ experience working in Big Four Accounting Firm. He is a Certified Tax Consultant C (BKP), Accountant Professional Education (Ak) from Trisakti University, Chartered Accountant (CA) and Certified Public Accountant (CPA).

william@mgi-gar.com

   

Benny B. T. Hutabarat

Benny received Bachelor of Laws from University of Indonesia and Master of Laws from Leiden University, Netherlands. He has extensive experience in both International and National Corporate and Commercial Matters, Merger and Acquisition, Foreign Investment, Joint Ventures, Corporate Restructuring and including European Business Law. He has worked in various international consulting firm and Non Government Organization.

benny@mgi-gar.com

           

Agus Yulianto

Mr. Agus Yulianto earned his Master of Accountancy from Case Western Reserve University, Cleveland Ohio, USA in 1993. He was servicing the government of Indonesia for no less than 16 years as Government Internal Auditor. He earned his Master in Accounting from Case Western Reserve University, Cleveland, US. He provided training for state own companies and also private companies in various auditing and accounting field, risk management and also consulting services in other areas for companies. He experienced as the member in Jakarta Initiative Task Force (Prakarsa Jakarta) to help companies in debt/loan restructuring. He was responsible for delivering audit services and corporate restructuring for our clients.

agus@mgi-gar.com

   

Wilham George Louhenapessy

Mr Louhenapessy received his PhD in Geomechanics and Finite  Element Model from University of Wales Swansea (Swansea University), Wales, UK. He is a Senior Structure and Geotechnical Engineer.  He has more than 20 years of professional experiences on numerous national projects and a secondment task in Singapore, includes 5 years of research experience at  Swansea University, UK, where he and the team developed computer algorithms for Geotechnical/ Geomechanics software worldwide. He has been assisting Jakarta Municipality (Pemprov DKI Jakarta) on Monorail Project and Superelevated Highway in Mega Kuningan Jakarta; BATAN (The National Nuclear Energy Agency of Indonesia) on Bangka Island Nuclear Power Plant Siting Project in 2011-2012; Royal HaskoningDHV on various Mining Infrastructure, Open Pit and Mini Hydro Projects in Indonesia; Mott MacDonald on various infrastructure projects in Singapore and Indonesia; SNC  Lavalin on Detailed Engineering Design for two Power Plant (Talang Duku, South Sumatra and Krakatau Daya Listrik, Banten) and for PT MKSI on a tunnel Section of The CISUMDAWU Toll Road in West Java.

wilham@mgi-gar.com