He's also directed at the Arcola Theatre and Southwark Playhouse in London. He served as an Associate Director at The Courtyard Theatre, in Hoxton East London where he was artistic Director of Versions, a month long festival of classical adaptations and devised theatre in commemoration of the 400th anniversary of Shakespeare.

"[Hertford] has a vision, thoughtfulness, artistry and fierce passion..." - Olivier award-winning Director, Robert Icke (1984 (play), The Oresteia, Hamlet)

From 2005 to 2011, he was a member of the Upright Citizens Brigade in Los Angeles as a Sketch Writer, performer and improviser. During that time he recurred as "Officer / Detective Ross" on the FOX comedy Raising Hope and as the tyrannical rival Choreographer Dakota Stanley during the first season of Glee. Other TV credits include Psych, various appearances on Conan and as the voice of Cadet Kryze on Star Wars: The Clone Wars.

In 2009 he co-founded the independent film company Sneak Attack with Director Ryan Darst. Their American New Wave award-winning short and full-length films (written by Hertford) have screened at festivals all over the US and Europe, including the premiere of the revenge film Wildlife at Cannes Film Festival (2015). The production shot all on location in rural Utah and co-stars Jon Heder and is scored by Joshua James.

In 2014 he received Best Actor awards for his work as Geneticist Jesse Darden in the science fiction independent feature film The Perfect 46 from the Other Worlds Film Festival in Austin, Texas and Filmquest Film Festival in Salt Lake City, Utah.

In 2015, he portrayed the role of iconic cult leader and convicted killer Charles Manson in the coming of age 1960s era thriller Prettyface.

Recent directing credits include his radical adaptations of Ibsen's An Enemy of the People as well as Chekhov's The Seagull and Ivanov, retitled, The Misbegotten Hope of the Dirty Bird (or A Meditation on the Proper Use of Firearms in Dramatic Literature)* and Poor Bastard (A Triumphant Guide to Midlife Crisis). His Shakespearean adaptations include: Høüses, an immersive LGBTQA version of Romeo & Juliet and Dóttir* - a bleak tragedy that explores seven of Shakespeare's motherless daughter archetypes. Additionally, he directed the 2016 critically acclaimed contemporary production of Henrik Ibsen's The League of Youth (in only its third UK production since publication in 1870) and a London fringe sellout run of Coverage, a newsroom retelling of Julius Caesar - both by Canadian Playwright Ashley Pearson. Other directing credits include the debuts of his original plays: Lunatic, a nü gothic psychological thriller based on Bram Stoker's Dracula, Anatomy of Arithmetic*, Bloke and Hero & Leander - adapted from Marlowe.