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Dr. Gabriel Walter

Founder & Group Chief Executive Officer

Dr. Gabriel Walter hails from Sarawak, Malaysia. A Kelabit by birth, which is one of the ethnic minorities from Sarawak. He received his B.S, M.S, and Ph.D. degrees in electrical engineering from the University of Illinois-Urbana Champaign (UIUC), Urbana, IL, in 1998, 2001, and 2003, respectively. He spent a total of 17 years in Illinois and Wisconsin, USA before permanently returning to Malaysia in 2013.

He is currently, the Group CEO, Adjunct Assistant Professor and major shareholder of Quantum Electro Opto Systems (QEOS) Sdn. Bhd., a Malaysian technology company which he co-founded in 2008 with Prof. Nick Holonyak Jr, the inventor of the Light Emitting Diode (LED) and Prof. Milton Feng.

Mohd Ghazali Mahmood

Executive Director

Mohd Ghazali Mahmood received his B.SC. Civil Engineering (Hons.) from the University of Southampton (UK) in 1975 and Diploma in Hydro Power from the Norweigian Institute of Technology, University of Trondheim (Norway) in 1981. He was a founding director of QEOS when it was incorporated in 2008, and is presently its Executive Director.

He started his career with the National Electicity Corporation where for nine years he was involved in the development of some of the major hydropower projects in Malaysia, namely the Temenggor and Kenyir Hydroelectric Power Plant Projects.

Siti Rubiah


Siti Rubiah is a Director for QEOS LED. She received her Bachelor of Accountancy (first class honors) from University Putra Malaysia (UPM) in 2012 and then became a member of Malaysian Institute of Accountants (MIA) in early 2016. She started her career as an associate auditor in Price Waterhouse Coopers (PWC) in 2012. She has experience in auditing public listed companies as well as multinational companies from various backgrounds ranging from plantations, manufacturing, pharmaceuticals, foods and beverages, logistics and services.

In 2014, she moved to commercial industries where she joined a public listed company, MSM Malaysia Holdings Berhad (MSM) as an executive and was promoted to Senior Accountant at the age of 28. After leaving MSM, she then took on the role as finance manager with QEOS. She is now in charge of all financial aspects for the QEOS group of companies including financial reporting, fund raising, and other finance matters.