Meet the SAPinsider Experts

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SAPinsider’s Experts, are a network of SAP professionals, coming together to provide guidance and share their how-to’s and tips, creating a comprehensive online subscription resource of practical information, best practices, and tutorials for SAP professionals. Our mission is to provide the tools and information you need to do your job, and help your company get the most from its SAP software systems.


Alaina Sammartano
Alaina Sammartano EY
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Alaina is a senior manager and CPA in Ernst & Young LLP’s Tax Technology and Transformation (TTT) practice with over 20 years of tax experience including international tax compliance and reporting and 17 years in industry tax leadership roles. She focuses on tax function performance improvement, operating model effectiveness, provision/compliance process and design, and tax technology integration. Alaina has operated as an in-house global tax process lead for several major finance transformations, and supports EY’s clients in their SAP S/4HANA transformation journey – ensuring that tax requirements are optimized to take advantage of next generation SAP enterprise tools.

Gregory Reeves
Gregory Reeves EY
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Greg is a Principal in Ernst & Young LLP’s Tax, Technology, and Transformation practice, with more than a decade of tax technology implementation experience specializing in intercompany transactions/transfer pricing and indirect tax solutions. Through his experience as both a system implementer and tax technical advisor, Greg has developed an in-depth knowledge of tax and transfer pricing applications. Greg holds a Juris Doctor from the University of Maryland School of Law and a Bachelor of Business Administration in Finance from James Madison University.

Peter Olanday Vertex
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Pete Olanday leads Vertex Consulting’s Retail Practice. Pete is responsible for the integration of Vertex’s Indirect Tax solutions in the retail space, specifically with Point-of-Sale (POS) systems and ecommerce platforms. He has been with Vertex for 10 years and has 24 years of system integration experience, 20 of which in the retail industry.

David Nickson
David Nickson EY
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David is a principal in Ernst & Young LLP’s Tax Technology and Transformation (TTT) practice and is the U.S. SAP Tax Alliance and East Region TTT leader. He has over 25 years’ of experience in international tax planning and corporate compliance, and supports clients across the full range of transformation – from tactical intelligent automation through to large scale business process and SAP programs, where tax and value chain/intercompany strategies must be operationalized and tax functional operations must be appropriately aligned. He is a Chartered Accountant, Chartered Tax Adviser, Enrolled Agent, and Six Sigma Black Belt.

Alex Mann
Alex Mann Harvey John
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Alex oversees our Tax division and personally specialises in recruiting within the EMEA Indirect Tax & Tax Technology markets, covering mandates from the Assistant Manager to leadership grades. From boutiques to the Big 4, and start-ups to multinational corporations, Alex manages a diverse portfolio of clients worldwide which has enabled him to develop a vast global network of indirect tax and tax technology professionals in 40+ countries.
Calvin Lai
Calvin Lai Ingram Micro
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Calvin Lai operates the US Indirect Tax function at Ingram Micro – an industry leader in global technology distribution. Leveraging his background in tax systems integration and process automation, Calvin’s main responsibilities at Ingram are to manage Sales & Use Tax Compliance, Property Taxes, Gross Receipts Taxes and Audits. Additionally, Calvin represents the Tax function in matters related to M&A (Due Diligence + PMI), Business Initiatives, Technology platform exploration and ERP implementations. Calvin is a Vertex Certified Professional.
Marc Hoessels PwC
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Marc is a director within PwC Belgium’s Business Advisory Services practice. He has over 25 years of experience with indirect taxes. He rejoined PwC in August 2015 and is a co-leader of the Belgian Indirect Tax – TPC team (Technology Process & Controls). Marc has managed various international co-ordination projects for leading MNC‘s and has helped various clients on how to determine their Tax-IT strategy. He has vast experience and understanding of the new developments that various Technology Providers are offering (such as SAP, Oracle, Vertex, Thomson Reuters, SAP Ariba, etc.). Marc assists with the roll-out of these Technology Solutions based on the specific business requirements of the client in various EU countries in companies and Shared Service Centers. He focuses on Compliance Automation, Tax Determination and indirect Tax Data Analytics. Marc has also hosted multiple webinars regarding tax automation and digital transformation.
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