Seth graduated from the University of Edinburgh in 2002 with an undergraduate Masters in Physics, and in 2007 he completed a PhD in Physical Chemistry at Bristol University, where his research focused on measuring the charge on colloidal particles in nonaqueous systems. He then worked on nanopore technologies as a postdoctoral research fellow at the University of Queensland in Brisbane, Australia, and investigated carbon nanotube materials during a postdoctoral position at Chiang Mai University in Chiang Mai, Thailand.

Seth joined Marks & Clerk in 2013 as a trainee patent attorney in the electronics group. He qualified as a European Patent Attorney in 2017, and completed his UK qualification in 2018.