Leading DNA Expert

Jonathan is a dedicated, highly experienced, leading DNA expert. In March 2012, he became director of Jonathan Whitaker - Principal Forensics Ltd. and is a co-director of Principal Forensic Services Ltd.

Improving the quality and standards of DNA profiling processes

With over 24 years as a leading forensic DNA practitioner, Jonathan has lead the research and development of the enhanced low template DNA profiling method of Low Copy Number.

He is widely credited for the concept and first use of Familial Searching in the context of searching the National DNA database for potential relatives of an offender.

He is a DNA assessor for the NRGD (Dutch Register of Court Experts) and also for the Chartered Society of Forensic Sciences Pre-Employment Assessment of Competence (PEAC).

Defence, Police and Government

Jonathan has considerable experience in sensitive, challenging and high profile cases both in the UK and overseas.

  • DNA mixtures, DNA statistics
  • Y STR DNA profiling
  • Low template DNA specialist

DNA Expert Witness

Jonathan will perform an independent interpretation of DNA profiling results to ensure that any conclusions reached are robust and reliable, fair and balanced, and stand up to expert scrutiny.

  • DNA transfer and persistence
  • DNA17
  • Cold case reviews

International Forensic Consultant

Providing expert forensic consultancy services to defence and criminal justice partners worldwide.

Forensic Consultancy Services

  • DNA profile interpretation: DNA mixtures, Y STR, DNA17
  • DNA expert witness, second opinion peer review and case review
  • DNA training
  • DNA quality investigations
  • Development of standards
  • Laboratory audit
  • DNA contamination issues

Frequently addressed questions

Has the DNA profile been interpreted correctly?
Do Low Template DNA issues apply?
Do the DNA profiles match?
Has the DNA profile been attributed to a body fluid?
Has the DNA profile been evaluated correctly either statistically or subjectively?
Issues addressing ‘when’ the DNA was deposited
Issues of DNA transfer: addressing ‘how’ the DNA got there - direct and indirect transfer
Issues of DNA persistence: addressing ‘how long’ the DNA has been there
Have different DNA transfer scenarios been proposed and evaluated? Is the opinion justified in the context of available data, current research and legal authority?
Does the work fully address the relevant issues?
Does the report consider both the prosecution and the defence alternatives?
Have any limitations and subjective views been clearly explained?
Have the scientific methods used been appropriately validated?
Are the conclusions robust and reliable and reported in the context of the case circumstances?