About us

UK-based Isentropic is a private engineering company founded in 2007 by James Macnaghten, Jonathan Howes and Mark Wagner to exploit and further develop the PHES technology conceived by Jonathan Howes in the late 1990s.

Isentropic Directors

Chief Executive: James Macnaghten
James, a Cambridge-trained engineer, has built up and run a number of companies in the Cambridge area.


Isentropic Directors

Technical Director: Jonathan Howes
Jonathan is an aeronautical engineer, formerly Head of Loads and Dynamics at the UK Civil Aviation Authority and was the European Aviation Safety Agency’s Lead Structures Specialist for the certification of the Airbus A380. He has spent many years working on the technologies that Isentropic is now developing.


Isentropic Directors

Chairman: Mark Wagner
After a career first in accounting and then in investment management, including running his own hedge fund, Mark is now involved in a number of energy-based technology companies.