Our Team

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  • Arjen Visser

    Arjen Visser

    Founder and CEO


    Arjen is a technical entrepreneur with over 20 years of experience in the IT industry. He is most passionate about database technology and especially Oracle database technology. He is driven to create complementary software solutions that are highly effective, simple to use, and in great demand. He is a well-known figure in the world of Oracle database experts and a frequent speaker at Oracle conferences.
    In his leisure time he enjoys playing tennis and sailing.

  • Mark Becerra

    Mark Becerra

    Regional Manager Americas


    Mark Becerra is a successful software salesman who has delighted in seeing customers achieve great improvements through the solutions he has sold them. His background includes significant time spent in the application areas of ERP, supply chain, and resource optimization. He is fluent in both English and Spanish.

  • Gary DuBois

    Gary DuBois

    Territory Manager


    Joining Dbvisit in mid-2015 and based in Orlando, Florida, Gary is responsible for Southeastern US direct and partnered sales.  His IT solution sales background includes selling hardware, networking, services and software including products for Oracle database replication and data integration.  Gary strives to provide value through attention to detail and excellent customer service.

    Gary enjoys running and competing in 5Ks and is happily married to his wife who is an avid Ultra runner.

  • Denis Kuramshin

    Denis Kuramshin

    Territory Manager Europe


    Denis is an experienced HighTech sales professional and networker. His background includes 15+ years in IT industry overall and 10+ years of IT solutions sales and channel management experience gained in SAP, CISCO and ORACLE.

    Besides spending time with his family Denis likes to try new things and has new hobbies every year. Last year it was public speaking, this year - crossfit and machine learning.

  • Chris Lawless

    Chris Lawless

    Vice President Product Management


    Chris is a passionate VP Product Manager with 11 years experience in the replication space. His past experience in training DBAs and working in support have taught him the value of customer interaction. Chris likes working with customers to make sure that their business needs are being met with technical tools and requirements. Chris loves to read, hike and canoe.

    Chris is in demand to present at industry events this year. Come and hear him speak when you have the opportunity. 

  • Anton Els

    Anton Els

    Vice President Product Development


    Anton is currently the Vice President Product Development at Dbvisit Software Limited and is responsible for the Dbvisit’s Disaster Recovery product line and has a wealth of experience working with Oracle technology for more than 15 years. He has successfully implemented many projects from small to large scale, delivering high-quality results within allocated time frames. He is an Oracle Database 11g Certified Master (OCM)  and has presented at various international conferences.  Other qualifications include Oracle certifications (OCP) in Oracle 8i through to 12c as well as certifications in Solaris and Red Hat system administration.

    His other interests include running, golf, movies and theatre.

  • Zeke Becerra

    Zeke Becerra

    Sales Development Representative


    Zeke lives in Houston, Texas and leads the sales development efforts in North America. He enjoys the challenge and reward of connecting with people who will benefit from our solutions. In his spare time, he loves spending time with his two daughters, exploring cuisine from various regions of the US and the world and wandering around art museums.

  • Mike Donovan

    Mike Donovan

    Global Business Development Manager


    Mike is a skilled Service and Online Delivery Manager who likes to work in a challenging and innovative environment. He has a diverse background in developing software, and is very experienced with Oracle.
    His other interests are: surfing, reading, running and music.

  • Bertie Plaatsman

    Bertie Plaatsman



    Bertie brings a creative edge to Dbvisit, employing her extensive marketing background to ensure more companies worldwide can benefit from our products. Bertie has a strong focus on customer care and building solid relationships with clients.
    Bertie speaks fluent English, Dutch and German. Based in New Zealand she loves hiking, gardening and art.

  • Mike Stephens

    Mike Stephens

    International Sales Director Asia


    Mike Stephens is a technology industry veteran who has strong experience providing  value solutions for clients across Asia over the last  17 years.  Mike is Singapore based and has worked with clients across the region and has been located in Shanghai, Mumbai, Jakarta, Hong Kong and Korea. His company background is in areas of Sales, Services and Delivery for ANZ Bank, Tandem Computers, Compaq Computers and Hewlett Packard.  More recently Mike set up and ran the Oracle On Demand Cloud across Asia Pacific so he brings to Dbvisit "hands on" exposure to the evolving IT needs of operating business applications, data management and  data dissemination in Cloud and On Premise environments.

  • Mark Ripma

    Mark Ripma



    Mark is a service and marketing executive with experience in the United States, New Zealand, and Europe. He has helped three software startups grow into global companies and is now advising Dbvisit on growing North American operations.
    He lives near Silicon Valley and enjoys family time and walking along the beach.

  • Vit Spinka

    Vit Spinka

    Lead Product Development


    Oracle 11g Certified Master, Oracle 11g Certified Professional, 8 years of Oracle experience Unix/Linux knowledge. Well versed in PL/SQL, Perl and C, strives for perfection with the motto: anything is achievable. He likes to learn something new every day.
    Other interests: classical music, exploring the depths of Oracle.

  • Kelly Langi

    Kelly Langi

    Territory Manager


    Kelly Langi has a background in a range of industries working in a sales, marketing and customer service capacity.
    In her spare time she enjoys spending time with family, cooking, gardening and craft.

  • Karen Halligan

    Karen Halligan

    Finance Manager


    Karen is a qualified accountant with experience working in a variety of industries providing assistance with all aspects of accounting. When she is not working she enjoys spending time with her family, cooking, gardening, hockey and softball.

  • Pierre Leducq

    Pierre Leducq

    Business Development


    Pierre joined Dbvisit in 2011 as an International Advisor. He oversees long-term business development for Dbvisit with a primary focus on France. With various experience in companies such as Orion Health (2 years) and Intersystems (18 years), he knows what it takes to embark successfully with new customers and for Application providers and resellers to adopt "best of breed" new technologies.
    Pierre received his international MBA from ISG in France and an undergraduate degree in electronics from ISEN.

  • Michael Whitehead

    Michael Whitehead

    Board Member

    Michael is the founder and CEO of Wherescape, a very successful globally operated software company specializing in data warehousing. Michael is a visionary when it comes to data warehouses and software to design, build and maintain data warehouses. He has spent more than a decade designing and building commercial data warehouses for customers in a wide variety of industries. Prior to founding WhereScape, Michael had Asia Pacific responsibilities for data warehousing for Sequent Computer Systems, Inc.

  • Tom McLeod

    Tom McLeod

    Board Member

    Originally from Canada, Tom moved to New Zealand many years ago to work in the IT industry. He has run his own IT start up - Dynamic Transport Management Ltd (now part of Oracle) - and has worked in Silicon Valley. He now works part-time for the NZ Government investing in hi-tech companies and runs his own consulting business advising IT companies on commercialization strategies.

  • Martin Knazovicky

    Martin Knazovicky

    Global Technical Services Manager

    Born and raised in Bratislava, Slovakia. Martin started working in IT industry in San Francisco’s Bay Area in 1998 and continued working with database and applications after he moved to Auckland, New Zealand in 2007. Martin is an Oracle and MS SQL certified DBA and has 15 years of experience working with hardware, systems, as well as administering various database technologies and applications. Martin has a can do attitude and believes where there's a will, there's a way.

    In his spare time Martin enjoys spending time with his family as well as getting out either hiking around New Zealand or sailing on Auckland’s Waitemata Harbour and beyond.

  • Kathy Howes

    Kathy Howes

    Marketing Manager


    Kathy has a background in the software industry working in a sales, marketing and communications capacity.
    In her spare time she can be found either with a camera in hand or exploring her local coastline by kayak.

  • Donna Guazzaloca-Zehl

    Donna Guazzaloca-Zehl

    Senior Pre-Sales Database Engineer


    Donna Guazzaloca-Zehl is a Senior Pre-Sales Database Engineer with years of DBA experience and is a technical wiz.  She has previously managed large teams of DBA's so she knows exactly what challenges they face and enjoys helping them solve issues by implementing replication solutions that meet the business needs and help them succeed. She understands the operational pressures of managing highly available systems and the need for managing expenses with shrinking IT budgets.

    Donna has a Bachelors Degree in Bio-Medical Computing & Masters Degree Software Engineering and Management from RIT. She is ITIL certified. Donna has two teenage sons who keep her very busy. She loves team sports, the outdoors and cooking, a vital skill with two teenagers. 

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