$\partial\textrm{SGP4}$ was developed during a project sponsored by the University of Oxford, while Giacomo Acciarini was at the OX4AILab collaborating with Dr. Atılım Güneş Baydin.
The main developers are: Giacomo Acciarini ( giacomo.acciarini@gmail.com ), Atılım Güneş Baydin ( gunes@robots.ox.ac.uk ).