I know the first letter of the sought after management model:

 
 
pest analysis
n/a
  • period: 1950-1959
  • country: United States
  • role: consultant and manager
  • activity: analyse
  • topic: marketing & sales and strategic management
 
product market matrix
Ansoff, H. Igor
  • period: 1957
  • country: Russian Federation
  • role: consultant and manager
  • activity: analyse, design and plan
  • topic: innovation, marketing & sales and strategic management
 
project management defined
Wijnen, Gert
  • period: 1984
  • country: Netherlands
  • role: change agent, consultant and programme & project manager
  • activity: implement and plan
  • topic: leadership & management and programme & project management