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Arathy Arun

Assistant Management Accountant


Arathy joined Mammoth in August 2018 as a Finance Assistant after graduating from the University of Hertfordshire with a degree in International Business. She loves travelling and experiencing other cultures; particularly their food.

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Veronica Castillo

Head of Production


Ronnie joined Mammoth in 2012 as Head of Production and oversees executive production management of the Mammoth slate from development to delivery. Her productions include the Bafta nominated NW, World On Fire, Vanity Fair and Mammoth’s slate of Agatha Christie titles. Prior to joining Mammoth, Ronnie worked as a freelance co-producer and line producer on high profile film and TV titles such as The Mark of Cain, the multiple Bafta-winning Sex Traffic, It’s A Boy Girl Thing, Birdsong & Zen. She particularly enjoys the challenge of foreign filming having worked extensively across the globe and is at her happiest when she has a boarding pass in her hand! Ronnie is an active member of the Heads of Production forum and a keen advocate of diversity and inclusion across the industry.

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Cheyenne Conway

Production Executive


Cheyenne joined Mammoth in 2021 as Production Executive, having previously worked as a Production Manager and Line Producer on high profile Film & TV such as Chernobyl for HBO and Sky, Louis Wain for StudioCanal and BBC Films, Hang Ups for Channel 4. She is also BAFTA nominated for Producing on Samuel-613. Cheyenne is passionate about improving inclusion and mental wellbeing in the industry.

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Stewart Dickson

Script Editor


Stewart is a script editor and joined Mammoth in 2021. He is currently script editing Grime Kids for BBC Three. After graduating from Bristol University, he worked as an assistant to writer/producer Matthew Orton, then as a researcher on Sanditon for Red Planet Pictures and ITV/PBS Masterpiece.

 

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Uju Enendu

Script Editor


Uju is a Script Editor and joined Mammoth in 2021.  She works across Mammoth’s diverse development and production slate and is currently script editing on Series VIII of Endeavour for ITV/PBS.  Uju previously supported the BBC’s TV Drama Commissioning Team after receiving a Distinction on the Playwriting & Screenwriting MA course at City, University of London.  Uju also has a background in theatre producing and dramaturgy and previously worked as a Finance Attorney at a New York law firm after receiving a JD in Law from Columbia University.

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James Gandhi

Executive Producer


James joined Mammoth in 2021 as an Executive Producer, having previously worked at Studio Lambert as Head of Scripted Development where he developed a slate of projects. Prior to working at Studio Lambert, James script edited a range of projects at Mammoth, including The City & the City and Noughts + Crosses for the BBC, and Fearless and Vanity Fair for ITV.

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Mark Hammond

Head of Finance


Mark joined Mammoth in September 2015 as Financial Controller, to support the integration into ITV and build the finance function processes to manage the growing business. He now manages the head office finance function as well as working closely with the production accounts teams. Before joining Mammoth, Mark worked in a couple of finance roles at ITV over a 4 year period. Prior to that, Mark worked in audit at Ernst & Young for 7 years, where he achieved his ACCA qualification. In his spare time, Mark enjoys spending time with his Family, plays Vets football and is a keen amateur golfer.

 

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Laura Johnston

Senior Business Affairs Manager


After studying law at Durham University, Laura was a solicitor at a leading commercial law firm before joining Mammoth in July 2016 as a Business Affairs Manager. Laura is based in the Belfast office.

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Rebecca Keane

Creative Director


Rebecca has worked at Mammoth since its launch, overseeing the development slate and working across shows in production. Before joining Mammoth, Rebecca was an Executive Producer at ITV Productions, and worked as a Producer and Script Executive for United Productions and a Script Editor for Carlton TV. She studied SPS at the University of Cambridge, ultimately abandoning a PhD to work in TV.

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Sarah Kelly

Business Affairs Coordinator


Sarah joined Mammoth in April 2019 and is based in the Belfast office. Sarah started her media career in the Operations Team at Stellify Media working on formats such as Who Wants To Be a Millionaire and Blind Date.

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Tom Leggett

Executive Producer


Tom joined Mammoth in 2018 to spearhead a slate of new projects.

Tom began his career in film production and development. He previously worked at Universal Pictures International, Element Pictures and Film4 where he worked on features including 71’, Room, The Riot Club, Macbeth and High-Rise. He left Film4 to work in TV Drama initially at Playground Television and then later at House Productions. At both companies, Tom worked with a wide array of different writers on series, mini-series and singles for all the major UK broadcasters.

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Harriet Lindsay-Stewart

Office Manager and Executive Assistant


Harriet joined Mammoth in January 2018 as Executive Assistant to Damien Timmer, Rebecca Keane and Karen Thrussell. In October 2021 she became the Office Manager.

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Preethi Mavahalli

Director of Drama


Preethi has developed and Executive Produced a slate of shows for Mammoth including most recently Noughts + Crosses for BBC One, as well as McDonald & Dodds, The City & The City and NW which was nominated for two BAFTA British Academy Television Awards. Upcoming shows include The Serpent for BBC / Netflix. Prior to joining Mammoth, Preethi worked in development at Film4, and at Film London on the micro-budget feature film scheme Microwave, where she worked across the slate of films from development through to exhibition – including the BAFTA-nominated Shifty and Ben Drew’s directorial debut Ill Manors. She also made a number of short films including a Random Act for Channel 4 directed by The Streets’ Mike Skinner.

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Melanie Morris

Development Executive


Melanie joined Mammoth in January 2012, originally to provide legal and business affairs support on the company’s projects, and spent 3 years as Mammoth’s Head of Business Affairs. She now splits her time between business affairs and development.  Before training as a lawyer, Melanie worked in television production and development for a number of indies in Dublin. She read English at the University of Oxford and has a masters from Trinity College Dublin in Anglo-Irish literature.

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James Penny

Managing Director


James is primarily responsible for all Mammoth’s commercial and business affairs, having joined the company in 2012. He was previously Head of Business Affairs (Drama, Comedy & Film) at Granada Television, then a partner at law firm Arthur Cox specialising in television production, financing and distribution. From 2006 he worked at Industry Media, a boutique commercial and business affairs consultancy, advising many of the UK’s leading television production companies, agencies, broadcasters and financiers. He is a member of the British Screen Forum and a director of Northern Ireland Fencing. James was a board member of Northern Ireland Screen for 10 years.

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Shikira Porter

Script Editor


Shikira joined Mammoth in 2021 as a Script Editor. She started her career reading scripts as an intern at various production companies and since then she has worked on developing shows for the BBC, Netflix and Channel 4.

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Joe Shrubb

Production & Development Coordinator


Joe began his career in the TV industry at the BBC as a floor runner and then a 3rd Assistant Director. After freelancing on various projects, including Endeavour series 3, he joined Mammoth’s head office as Production Assistant. Since then he has progressed through to his current role of Production & Development Coordinator. Amongst other things, Joe looks after submissions and supports the production teams working across the Mammoth slate.

 

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Damien Timmer

Chief Executive Officer and Founder


Damien established Mammoth in 2007, working on a wide range of dramas including Parade’s End, Poldark, NW, Noughts + Crosses and World on Fire. Prior to this he was Head of Drama for ITV Productions for five years, working on shows including Housewife 49 and Casanova. Damien worked at United Productions for three years as an Executive Producer, and before this worked at Central Films and Carlton as a producer, development executive and script editor.

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Jon Williams

Chief Operating Officer


Jon joined Mammoth as Director of Production & Finance just after its inception in 2007 and has overseen all of Mammoth’s production and financial affairs since. Prior to this he was Production Executive at ITV Productions, managing productions including Agatha Christie’s Marple, William & Mary, The Last Detective and The Brief. Previously he was Finance Manager for Granada Media working across drama productions such as Prime Suspect, Sex Traffic, Cold Feet, Dr Zhivago, Island at War, Henry VIII and The Forsyte Saga. Jon cut his production teeth at United Productions, initially as a management accountant and then as production accountant on Hearts and Bones and Where the Heart Is. He is a Chartered Management Accountant.

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Lorena Wright

Production Executive


Lorena joined Mammoth Screen in March 2021 as Production Executive. Starting out as an Assistant Director on studio features, Lorena trained as a Line Producer under veteran industry Producer, Steve Clark-Hall, working alongside him on The Man from UNCLE and Arthur: Legend of the Sword for Warner Bros and consulting on low to mid budget features in the independent space. Before joining Mammoth she worked across a slate of projects with Colin Firth and Ged Doherty for their production company, Raindog Films. She has worked with The Electric Shadow Company, The BFI, The BBC, Rebel Park Productions and Bella Freud and has produced BAFTA and Academy Award shortlisted shorts with Creative England and The Justice and Equality Fund. A working mother with a small child, Lorena is an advocate for Keeping Families in Film and TV.

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Helen Ziegler

Director of Television


Helen is Director of Television at Mammoth. Her recent Executive Producer credits include Peter Bowker’s BBC One epic drama, World on Fire; the latest BBC One Agatha Christie adaptations by Sarah Phelps, The Pale Horse, The ABC Murders and Ordeal by Innocence; and Russell Lewis’ critically-acclaimed prequel to Morse, Endeavour for ITV. She is currently working on World on Fire series 2, Endeavour series 8 and a variety of new developments. Helen began her career script editing on the Golden Globe-winning psychological crime drama Luther and multi-award-winning continuing drama EastEnders. Her first producer credit was From Darkness and this was followed by Endeavour series 4.