Aspectus will be responsible for delivering ProSep’s strategic comms and media campaigns across the Americas, Europe, Africa, the Middle East and Asia Pacific.
ProSep currently employs more than 100 people worldwide and has secured over $38.4m (£24.5m) in new contracts so far this year.
Megain Buchan, PR and marketing manager at ProSep, said: "ProSep has set an ambitious growth strategy for the next five years and it is essential we have the right partners in place to support us. Aspectus PR is a forward-thinking agency with in-depth sector knowledge and an innovative approach to PR and communications."
Kate Garratt, head of energy at Aspectus PR, said: "The global marketplace must understand, buy into and trust ProSep’s products and services. We have proven expertise in delivering the results our clients desire in the energy market. By developing penetrative, consistent and memorable campaigns delivered via multiple channels, we will create enhanced conditions for ProSep to successfully deliver its global sales strategy."