Gartner Expert

Tessa Mahon

Director Analyst

Tessa Mahon is a Research Director in the Gartner Supply Chain Research & Advisory group. She is focused on helping clients deliver optimal results through continuous learning and personal development in supply chain best practices. Ms. Mahon specializes in the development and implementation of sales and operations planning (S&OP), demand planning and inventory planning.

Previous experience

Prior to joining Gartner, Ms. Mahon was a supply chain practitioner focused on continuous improvements, proactively leading change in supply chain processes. Her previous achievements included the implementation of S&OP, driving changes to demand planning, finished goods supply planning and the management of inventory.

Just prior to joining Gartner, Ms. Mahon worked at Australian Pharmaceuticals (API) on the project team to deliver SAP Unified Demand Forecasting (UDF) and then to lead and manage the demand team through a new demand organization set-up, including resourcing, processes and routines, metrics and RACI.

Ms. Mahon has a deep passion for Supply Chain planning with experience spanning 15 years across varying industries.

Professional background

Australian Pharmaceuticals Industries (API)

Business Process Lead and Demand Planning Manager


Demand Planning Manager


S&OP Manager

Areas of coverage

Supply Chain Planning


Master of Marketing, Supply Chain and Logistics, Monash University, Melbourne Australia

Bachelor of Commerce, The University of Melbourne, Melbourne Australia

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Top Issues That I Help Clients Address

1Development and implementation of S&OP processes from scratch

2How to implement a demand planning organization and processes

3How to improve demand and supply planning processes

4Demand segmentation and metrics to support optimal balancing of demand and supply

5Leveraging sales and operations execution to support short-term profitability based decision-making