She was President Strategy & Sustainability from 2021 to January 2024, President Strategy & Innovation from 2019 to 2021, SVP Strategy and Corporate Affairs in Gas Renewables & Power from 2016 to 2019 and SVP Strategy & Business Intelligence from January 2012 to September 2016, deputy SVP Strategy from 2011 to 2012 within the Company she joined in 2011. Between 1994 and 2011, she held a number of general management positions within the Alcatel group, which became Alcatel-Lucent, and then Nokia.

A dual Danish and French national, Helle Kristoffersen is a graduate of the École Normale Supérieure (Ulm) and the Paris Graduate School of Economics, Statistics and Finance (ENSAE). She also holds a master's degree in econometrics from Université Paris Sorbonne. She is an alumna of the French Institute for Higher National Defense Studies (IHEDN) and a Knight of the French Legion of Honor.