About Me

I enjoyed working at IBM: it was full of bright enthusiastic people who were mostly the same age as me. Some highlights were:

  • The early years with MPSX.
  • The STRUDL team.
  • Assignment in Boca Raton with the IBM PC division.
  • Managing the forecasting team at ASE.

But all good things come to an end: in 1996 IBM and I parted company and I started Decision Models with the objective of providing consultancy, software development and tools for decision support.

I have always been interested in pushing the boundaries of whatever software I am working with and so I was soon bumping up against the memory and performance limits of Excel. This led to the launch in 2001 of my website Decision Models. and FastExcel , my commercial product for profiling Excel calculation performance and memory useage. In the last 10 years FastExcel has been selling steadily and has been updated to run with each new version of (Windows) Excel.

My latest challenge is to learn C++ and start developing a new family of fast Excel functions to help minimise the slowdown caused by excessive use of Lookups, SUMPRODUCT and array formulae.

In 2009 Microsoft awarded me the honour of becoming a Microsoft Excel MVP. The best part of this award is getting to meet the Excel team and some of the legends of the Excel world at the annual MVP summit in Redmond.

My other passion is racing my Wayfarer dinghy TANJ3:

2 Responses to About Me

  1. Dear Charles,

    I am delighted to see you blogging. Though I had purchased Fast Excel about 7 years back, I still hadn’t used it as intended except for profiling workbook. I use it mainly for Name Manager. That is quite strange because I had purchased it to speed-up my Excel files. I haven’t yet made any assessment why it happened, but I will blame it on my reluctancy to read all the Fast Excel Help. But I am on my way to start using the Fast Excel stuff very soon. Hope to post my issues here as I always avoided contacting you via email for any help. Surely the stuff on this blog is going to be unique and top-class.

    Regards
    CA Kanwaljit Singh Dhunna

  2. Excel beginner says:

    Hello,
    1-I wante to say thanks as you have helped me resolved my problem.
    2- Is it possible to add twitter account that I can follow your posting as RSS is not so funny in my opinion.

    Thanks and Regards

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s