Ehson graduated from the University of Sydney with a combined Bachelor of Laws (First Class Honours) and Bachelor of Economics (majoring in Economics) in 2009.

During his time at university, Ehson undertook extensive study in employment and industrial relations law. He was the recipient of the Frank Albert Prize for High Achievement in 2005; the Walter Reid Memorial Prize for Proficiency in Law in 2007; and both the Allens Arthur Robinson and the Christopher C. Hodgekiss Prizes for Competition Law in 2009.

Ehson joined Harmers as a Summer Clerk in 2008 and continued to work as a paralegal until the completion of his studies. Ehson will be admitted as a solicitor late in 2010.