About Us
Johnson & Arrowsmith Medicolegal is led by two directors with a shared commitment to precision, professionalism, and the highest standards in medicolegal support.
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With complementary backgrounds and a deep understanding of the demands of the criminal, civil, and coronial justice systems, Johnson & Arrowsmith Medicolegal provide a uniquely specialised service.
Ashlie Johnson
B.Sc. (Hons)
Director
Specialist areas:
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Large-scale major crime investigations, including public enquiries
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Complex multi-expert instructions
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Legal framework for experts
Ashlie Johnson (née Cox) is an experienced medicolegal consultant specialising in the coordination and delivery of forensic and medical expert witness services to the criminal justice and coronial systems.
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She spent six years at the National Crime Agency’s Forensic Medical Advice Team (formerly National Injuries Database), where she was the tactical lead for large-scale and sensitive criminal investigations, including public inquiries, involving multiple deaths and serious harm within a healthcare setting. Her meticulous approach to case management and understanding of both legal and forensic contexts made her a trusted adviser in multi-agency operations. Additionally, Ashlie specialised in criminal investigations into homicide, non-accidental injury and neglect to children, and provided national police training to SIO’s and investigators on these topics. During her tenure at the NCA, Ashlie received multiple formal commendations recognising her contribution to successful prosecutions and national forensic medical strategy, including a Director of Investigations Commendation Award.
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Following her work with the NCA, she joined McCollum Consultants, where she went on to establish and lead the criminal and coronial division, further refining her expertise in coordinating expert evidence within legal frameworks.
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Ashlie holds a First-Class Honours degree in Forensic Science from Northumbria University.
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At Johnson & Arrowsmith Medicolegal, Ashlie is responsible for strategic oversight, expert instruction, and ensuring the highest standards of quality and compliance in every case.
Louisa Arrowsmith
Director
Specialist areas:
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Expert selection and utilisation
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Medical evidence gathering
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Quality reviewing of expert witness reports
B.Sc. (Hons)
Louisa Arrowsmith is an experienced medicolegal consultant with a diverse background spanning analytical chemistry, forensic medicine, pathology and biomedical engineering.
With a First-Class Honours degree in Forensic Science from De Montfort University, Louisa began her career in laboratory-based analytical roles before progressing into medicolegal investigation.
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She spent three years with the National Crime Agency's Forensic Medical Advise Team, providing expert guidance to all 43 UK police forces on complex medical issues within major crime investigations, including homicides, suspicious deaths, and serious sexual offences. The role involved managing a network of over 350 medicolegal experts and coordinating their instruction for investigations. Louisa also provided nationwide training to police forces on sensitive topics such as child death investigations, non-fatal strangulation, and female genital mutilation. Her work frequently involved collaboration with pathologists, investigators, and other forensic specialists in high-profile cases across the UK.
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Louisa undertook a traineeship at Bioforensic Consulting Inc. in the United States of America which allowed her to expand her expertise into forensic biomechanics and civil investigations in the USA.
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At Johnson & Arrowsmith Medicolegal, Louisa is responsible for strategic oversight, expert instruction, and ensuring the highest standards of quality and compliance in every case.