John Marshall

About John Marshall

John Marshall is the President and Founder of The Self Management Group, and has a doctorate in psychology from York University. For over three decades, SMG has used advanced statistical methods and principles to become a leader in applied research and using predictive analytics to assist organisations in attracting, selecting, and developing top performers. The Self Management Group is exclusively represented in Southern Africa by ThinkSales Corporation.

Not all great sales people are great sales managers. Ensure that your company culture identifies management potential without eroding the value of sales talent.


Finding and identifying high effort sales people from within the available candidates is one of the most important parts of building a top performing sales team.


You know you need to have high performing, talented salespeople on any competitive sales team. However, not everyone is suited for competitive sales environments – and even those who are able to perform in the role will have varying degrees of success

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