People
Expert auditors,
global perspectives,
local knowledge
Every member of our senior leadership team has built their expertise at the frontline of fund and SPV audits. They remain directly involved from the moment you onboard with Valaston, through each audit cycle, offering a level of personal and expert continuity that larger generalist firms cannot match.
Our commitment
Direct access to seniors
Our most experienced auditors guide every engagement, ensuring quick decision-making, consistent knowledge transfer, and transparent communication.
Global collaboration
We operate across time zones and jurisdictions, providing region-specific insights and scalable services wherever your funds are domiciled.
Commitment to growth
We continuously invest in training and professional development, particularly in emerging areas such as digital-asset audits. You can be assured that our team can operate effectively when auditing the most complex asset classes.
Meet the team
Senior leadership team
Gráinne Twomey
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Gráinne Twomey, Head of Assurance, Partner Grainne’s team audits a broad portfolio of mutual funds, private equity firms, venture capital funds, digital asset vehicles, hedge funds, securitisation structures and SPVs — bringing independence, agility, and deep sector expertise to each engagement. |
Gráinne Twomey
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| Gráinne Twomey, Head of Assurance, Partner Gráinne Twomey leads Valaston’s global assurance practice, specialising in independent audits for investment funds and Special Purpose Vehicles (SPVs). With over 20 years’ experience in audit and assurance, Gráinne brings unwavering commitment and expertise to this specialised sector, providing clear technical judgments and board-level insight across both traditional and emerging asset classes. Grainne’s team audits a broad portfolio of mutual funds, private equity firms, venture capital funds, digital asset vehicles, hedge funds, securitisation structures and SPVs — bringing independence, agility, and deep sector expertise to each engagement. |
Rajaraman Arumugan
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Rajaraman Arumugan. Director, Singapore Raja has developed niche expertise in digital and cryptocurrency audits and plays a key role in staff development, audit quality, and business growth in Singapore. His background includes broad industry experience before specialising in complex investment assets. |
Jerry Dee
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Partner, Cayman Islands As regulations evolve and investment strategies grow in complexity, Jerry ensures clients receive timely, compliant, and transparent audit outcomes tailored to their structural needs. He also co-leads internal research on digital asset audit methodologies and fair value frameworks, helping Valaston stay at the forefront of assurance innovation. |
Bauke Hoogland
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Director, Netherlands Bauke Hoogland leads Valaston’s audit and risk functions in the Netherlands. Since 2015, he has specialised in asset management and investment fund audits, building on his earlier experience with pension funds and alternative investments. His expertise spans risk, IT audits, internal control assessments, and ISAE 3402 reporting—offering a versatile and technically grounded approach to audit and assurance. In 2025, Bauke led the successful application for Valaston’s Wta audit licence and played a key role in establishing the firm’s Dutch operations. |
Paul Kinsella
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Partner, Ireland & UK He has experience working across key global fund jurisdictions including Ireland, the UK, the Netherlands, Singapore, Hong Kong, the Cayman Islands, and the British Virgin Islands. Paul leads audit engagements for investment funds, SPVs, and management companies, providing high-quality, independent assurance and insight across the full fund lifecycle. |
Ross McLoughlin
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Ross McLoughlin. Partner, Ireland & UK At Valaston, Ross leads audit engagements for SPVs and infrastructure investment vehicles globally. His work spans regulated investment funds along with securitisation audits and valuation of both liquid and hard asset strategies, delivering audits that foster confidence through technical depth, clarity, and consistency across audit cycles. |
Sim Guan Seng
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Sim Guan Seng is the Managing Director of Valaston Assurance PAC. In 1992, he established his sole proprietorship, Sim Guan Seng & Co., which later merged with Baker Tilly TFW. From 2010 to 2019, Sim Guan Seng served as the Managing Partner of Baker Tilly TFW LLP. A Fellow of the Institute of Singapore Chartered Accountants, Guan Seng currently sits on the boards of three SGX listed companies and several charities.
Sim Guan Seng served as a board member and Audit Committee Chairman of the Singapore Accountancy Commission from 2015 to 2021 and as board member and Regional Chairman Asia Pacific Region of Baker Tilly International from 2016 to 2020. Sim Guan Seng leads Valaston Assurance PAC in Singapore |
Rajaraman Arumugan
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Rajaraman Arumugan. Director, Singapore Raja has developed niche expertise in digital and cryptocurrency audits and plays a key role in staff development, audit quality, and business growth in Singapore. His background includes broad industry experience before specialising in complex investment assets. |
Jerry Dee
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Partner, Cayman Islands As regulations evolve and investment strategies grow in complexity, Jerry ensures clients receive timely, compliant, and transparent audit outcomes tailored to their structural needs. He also co-leads internal research on digital asset audit methodologies and fair value frameworks, helping Valaston stay at the forefront of assurance innovation. |
Bauke Hoogland
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Director, Netherlands Bauke Hoogland leads Valaston’s audit and risk functions in the Netherlands. Since 2015, he has specialised in asset management and investment fund audits, building on his earlier experience with pension funds and alternative investments. His expertise spans risk, IT audits, internal control assessments, and ISAE 3402 reporting—offering a versatile and technically grounded approach to audit and assurance. In 2025, Bauke led the successful application for Valaston’s Wta audit licence and played a key role in establishing the firm’s Dutch operations. |
Paul Kinsella
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Partner, Ireland & UK He has experience working across key global fund jurisdictions including Ireland, the UK, the Netherlands, Singapore, Hong Kong, the Cayman Islands, and the British Virgin Islands. Paul leads audit engagements for investment funds, SPVs, and management companies, providing high-quality, independent assurance and insight across the full fund lifecycle. |
Ross McLoughlin
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| Ross McLoughlin. Partner, Ireland & UK Ross McLoughlin brings over 20 years’ experience in audit, financial control, and corporate finance, with a focus on regulated and unregulated fund structures, private equity, and credit funds. At Valaston, Ross leads audit engagements for SPVs and infrastructure investment vehicles globally. His work spans regulated investment funds along with securitisation audits and valuation of both liquid and hard asset strategies, delivering audits that foster confidence through technical depth, clarity, and consistency across audit cycles. |
Sim Guan Seng
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| Founding Member Sim Guan Seng is the Managing Director of Valaston Assurance PAC. In 1992, he established his sole proprietorship, Sim Guan Seng & Co., which later merged with Baker Tilly TFW. From 2010 to 2019, Sim Guan Seng served as the Managing Partner of Baker Tilly TFW LLP. A Fellow of the Institute of Singapore Chartered Accountants, Guan Seng currently sits on the boards of three SGX listed companies and several charities. Sim Guan Seng served as a board member and Audit Committee Chairman of the Singapore Accountancy Commission from 2015 to 2021 and as board member and Regional Chairman Asia Pacific Region of Baker Tilly International from 2016 to 2020. Sim Guan Seng leads Valaston Assurance PAC in Singapore |
Founding principal
Ian Doran
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Founding principal |
Ian Doran
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Founding principal |
Senior client contacts
Ezekiel Andasan
Manager
Ezekiel Andasan is a Certified Public Accountant, He operates as an Audit Manager at Valaston, leveraging his 10 years’ experience in the audit and investment industries.
Joan Deterala
Senior Audit Manager
Joan is a CPA-qualified Senior Audit Manager, with over ten years of experience in the asset management industry, covering hedge funds, private equity, and venture capital funds.
Kathleen Eliseo
Kat is a Certified Public Accountant and Audit Manager specializing in fund investment audits for entities in the Cayman Islands, UK, Ireland, and BVI. She has over 10 years of audit experience and an MBA from Dublin Business School.
Stephen Hua
Blockchain Specialist
Stephen is a qualified Chartered Accountant and Blockchain Specialist within the Valaston team. With over five years’ experience working in the digital asset space, Stephen has developed specific technical expertise in blockchain infrastructure and digital asset investments. Stephen assists clients in developing automated solutions to reconcile chain data to accounting records.
Henry Hui
Audit Manager
An ACCA-qualified Audit Manager, Henry leads audit engagements across multiple jurisdictions and fund structures. Henry has extensive expertise in hedge fund, private equity and SPVs.
Manisha Iyengar
Senior Audit Manager
Manisha is a Senior Audit Manager at Valaston with extensive expertise in asset management and investment funds. A Chartered Accountant with over eight years’ experience, Manisha is instrumental in leading the audit process for mutual fund companies, private equity investments and SPVs.
Vignesh Iyer
Senior Audit Manager
Vignesh Iyer is an ACA-qualified professional auditor, with a background in financial reporting and management information systems. He brings our clients deep audit expertise backed with extensive working knowledge on digital assets and financial tokenization.
Joanne Lim
Manager
Joanne Lim is an Audit Manager at Valaston. She has over 10 years’ experience in complex investment fund audit processes. She is Certified Public Accountant (CPA).
Nestor Linsangan
Manager
Nestor is a Certified Public Accountant and Audit Manager with expertise in IFRS and GAAP, skilled in financial statement review. He has delivered audits for mutual fund companies, private equity investments, and a wide range of other investment entities.
Wan Lin Lee
Senior Audit Manager
A Certified Public Accountant, Wan Lin is Senior Audit Manager based at our Singapore office with over thirteen years audit experience. Wan Lin has specialist expertise in accounting and financial reporting issues in digital assets and leads the technical aspects of our staff training and professional development, ensuring that our clients benefit from our growing company-wide technical excellence in digital and crypto asset audits.
Bryan Tan
Manager
Bryan is an ACCA-qualified Audit Manager at Valaston. He leads audit engagements, leveraging his extensive experience auditing a diverse portfolio of fund and asset management clients.
Wei Rong Tan
Audit Manager
Wei Rong is a CPA-qualified Audit Manager at Valaston, based in our Singapore office. With over 15 years audit experience, Wei Rong has deep, technical expertise in digital assets and financial tokenization.