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Work experience

May 2007Sep 2012

IS Audit Manager


•Conductedrisk based InformationSystemsaudits primarily testing; physical and logical access controls, segregation of duties, business continuity, database and wireless network security, and system resilience for known vulnerabilities.

•Conduced IT Project Management Audits, to ensure business and IT integration; effective change control on project cost, scope, and timing; User Acceptance Testing, appropriate levels of training, and security measures implemented based on corporate policy.







•DefinedACLscriptsfordata analysis onAccounts PayablesandReceivablescashflow,BillofMaterials,SegregationofDuties,and Access Controls.

Jun 2003May 2007

Enterprise Systems Manager


• Responsible for Datacenter operations hosting Meritor's ERP systems supporting 34European manufacturing sites, offices and warehouses.

• Responsible for infrastructure roll-out and operations of Axapta ERP system focusing onSQL Server database management.

• Set Global standards for Change Control, Access Controls and Segregation of Duties for SOXCompliance.

• Conducted management self-testing at European locations to ensure effective IT operational controls.

• Responsible for sizing computer systems, placing orders, receiving, assembly, and deploying new systems on the corporate network in compliance  with change management, and security requirements.

• Responsible for setup and created monitoring alerts using WhatsUpGold.  This allowed us to be proactive noticed of low disk space, bandwidth issues, or hardware failures for example.

• Responsible for piloting new technology such as virtualization allowing for the consolidation of physical servers to virtual servers making our infrastructure more efficient resulting in cost savings. 

May 2000Jun 2003

IT Manager

Binck Bank







•Producedaplanfortheacquisition,implementationandmaintenanceofthetechnologicalinfrastructure tomeetbusinessrequirements.





Sep 2007Dec 2000

Microsoft Consultant

Charles Schwab

• SMS was Microsoft's Management Server that allowed for the deployment of application installations, updated, and changes from a central location.  We managed 50 SMS servers which serviced more then 1200 clients downstream.  This technology allowed for application standardisation, and greatly reduced deployment time thus saving money.





• As a Microsoft Certified Solutions Expert, my daily responsibilities required deep technical knowledge of the operation systems its registry, networking, and common services such as WINS, DNS, DHCP, file systems, access permissions.

Sep 1995May 1997

Senior Network Engineer


• Responsible for central application maintenance travelling nationally to install and resolve problems for over back-end systems supporting 10,000 users in a national network based on Novell servers.

• Oversaw the entire NT environment, designed, implementing a master domain with all its related services , and introduced SMS to the company.

• Facilitated all phases of implementation of client/server application software on the client side, thus defining, troubleshooting, and the implementing ODBC configurations to end-users nationally. 

• Served as the single point of contact for resolving SQL Database connectivity issues over TCP/IP and NetWare networking nationwide.


Technical Support Representative


• Responsible for resolving customer issues with Borland's ReportWriter.  This product allowed users to establish a direct connection to back-end databases and populate defined reports.  This allowed creating on meaningful ad-hoc reports and standard reports.

• Established a number of test environments using all common clients-server configurations.   This included back-end server on UNIX, Windows, and Novell all running common databases.  The test environment is invaluable in recreating user problems for troubleshooting.


Technical Support Representative


• Provided phone support to Novell customers regarding TCP/IP network configuration and routing.

•  Provide phone support to customers regarding UNIXWare, resolving installation, configuration, and performance issues.

• Resolved issues with installation, configuration, routing, Bootp, host emulation, keyboard re-mapping, dial-up connectivity.



TeamMate Audit Suite
ACL Data Analysis


Chip Mower

Marvin joined the internal audit team as an outstanding internal hire from the ArvinMeritor, Inc. Information Systems (IS) team located in The Netherlands. While Marvin had little formal audit experience at that time, he brought a wealth of operational experience and business risk knowledge with him. Marvin immediately took the initiative to obtain the necessary IS audit training to develop his auditing skills and obtain his CISA. His continuing desire to grow personally and professionally has enabled him to deepen his knowledge of IS business risks and the relevant controls necessary to mitigate them. Marvin was a key member of the implementation team of ACL and the next generation TeamMate audit software that was introduced. This was added value to his responsibilities of managing IS audits in Europe and Asia, and supporting the various non-IS audit teams located globally. Marvin would make an excellent addition to any internal audit or IS organization.”

Hugo Tap

“I’ve experienced Tristan as a manager with hands on mentality who got the job done. He setup the IT department from scratch and did it in a way which gained approval of the AFM (Investment Supervisory Authority), but which was also efficient enough to serve the many needs of the high demanding management and users of this (stock) broker startup company.

Ivan Bianchi

“Marvin is a high valuable professional; I have had the opportunity to work with him during an implementation of Dynamics AX in a multi-national environment for his company. He demonstrated from the beginning competence, precision and consistency in addition to great honesty in relationships with vendors, customers and co-workers.”

Bridget Kravchenko

“I highly recommend Marvin. Marvin worked for me as an IT Audit Manager. Marvin has the rare audit skillset and ability to understand the very technical IT audit areas such as Windows and Network as well as understanding the business. He is very comfortable conducting highly analytical data inquiries to ensure proper accounts payable payments and appropriations. These two skillsets are hard to find in one auditor. Marvin was always highly motivated and a positive role model for the team.”

Juman Doleh-Alomary

“I had the pleasure of working with Tristan on multiple assignments at ArvinMeritor globally. Tristan was new to audit but he was a fast learner and very dedicated. His technical background allowed him to achieve in a very short period of time his CISA and CISM. He is an excellent communicator and an asset to any organization. Will work again with Tristan in a heart beat.

Christopher Peterson

“Marvin holds a similar position as mine at ArvinMeritor, but covers the extended geography covering non-North American sites. He is a pleasure to work with and always brings a thoughtful approach to projects. I continue to be pleased with (and motivated by) his efforts to continuously improve himself and the audit team. Marvin certainly understands his role in the company and delivers great results; his role requires him to be physically separate from the bulk of the audit team, but his attitude is consistently positive and I appreciate his humble demeanor.”


Provide information systems assurance, security, and risk management solutions to increase transparency and add value.


Technical Highlights

SecurityandInformationsystemscontrol-relatedconceptsandtechniques,TCP/IPprotocol,localandwideareanetworkmanagement,Ciscoroutersandswitches,Checkpointfirewall,DOS,Windows,UNIX platforms,IISWebmanagement,VMware,wirelesscommunications,VPN,Encryption,SMS,MicrosoftSQLserver,Axapta,MFG/Pro,Oracle,EDI,hardwareandsoftwareclustering,MicrosoftOfficetools,Teammate,ACL,Nessus