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Greg Kreis

Greg Kreis worked for the Veterans Administration as a programmer and projects manager from 1983-1985. He then implemented VistA systems for two companies before starting Pioneer Data Systems in 1989.


Webinar Overview

M is the latest name for the MUMPS language - which was revised as recently as 2005 by ISO. All the major VistA derivative solutions (WorldVistA, vxVistA, and Medsphere’s OpenVistA) are MUMPS (henceforth M) based solutions are derived from the FOIA release of VA/VHA VistA. M is at the core of many of the largest healthcare and financial systems that everyone in the world interacts with on a daily basis. It is a language derived from years of healthcare and finance experience - and years of development after 1969 both inside and outside of Mass. General.

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Pioneer Data Systems Website






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Recent Questions


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  1. Being a MUMPS programmer is easy to learn. Books by Dick Walters and Kevin O'Kane are still available - Martin Mendelson

  2. BEWARE - Cache allows non-standards code that crashes other versions of MUMPS

  3. Do the brown blocks correspond to the context for individual users sessions?

  4. Where I can find a clean dat file?

  5. Where can I find information and/or instructions on how to perform "queries"?

  6. Which reference document do you recommend for learning the M language?

  7. Why bother to map to tables -if we can query the data with MUMPS and it's faster?

  8. Can you tell us what the $G of ^ABC(1,3) would be? I.E. what data is returned by the $Get function for a specific node such as this