Consultant Clinical Child Psychologist and Expert Witness
David acts as an Expert Witness or Advisor for the Courts, the Police and other organisations in relation to trauma and bereavement. He has particular expertise and extensive experience of working with children who have witnessed one parent murdering another. He has been consulted following critical incidents to inform the crisis response and he was commissioned by the UK Government’s Department for Culture, Media and Sport to evaluate the Humanitarian Assistance Centre established in response to the London terrorist attacks on 7th July 2005.

Lee Rainbow is the Head of Profession for Behavioural Investigative Advice within the National Policing Improvements Agency and secretary of the ACPO Sub-Committee for Behavioural Science.
After gaining an MSc in Investigative Psychology in 1996, he subsequently worked within Cleveland Constabulary as a criminal intelligence analyst and Surrey Police as a behavioural science consultant before being employed by the NCF (now NPIA) as the first ever full time Behavioural Investigative Adviser. He has produced over 250 written reports in support of serious crime enquiries and has supported many of the most high-profile cases in the UK, as well as cases in Europe and the Caribbean. He has played a leading role in the national co-ordination of behavioural investigative advice within the UK, and has contributed significantly to the enhanced professionalization of the discipline for both a tactical and strategic perspective.

ALBERT KIRBY
Among those assisting police in Portugal is the retired senior Merseyside police officer who led the James Bulger murder inquiry.
Albert Kirby, the former commander of the Liverpool serious crimes squad, flew to the Algarve in the hope that his experience could come in useful.

DAVID BARCLAY

DAN KRANE
Dan Krane (forensic expert) is a DNA specialist from Ohio, has been hired to defend the forensic case against them. Krane, a biology professor from Wright University in Pennsylvania, has taken part in more than 60 judgments where DNA evidence was crucial to the case. Krane plans to use a software program he and colleagues at the university invented to interpret automated DNA analysis generated by a crime lab.

MICK SWINDELLS (Dog Handler - former Police Sergeant)
Mick Swindells is one of Britain's top dog handlers. He is a former police Sergeant, based in Blackpool, Lancashire but was often called upon by other police forces for his expertise. Lancashire Constabulary was a pioneer in the training of dogs to sniff out dead bodies following the Moors Murders case in 1964. Mick is now a member of The Global Rescue Services charity based in Penmaenmawr in Conwy. The ex-Fylde officer was part of the joint operation by international rescue charities CANIS and Rapid UK after the Pakistani earthquake; he worked at the Margala Towers complex in Islamabad. The Global Rescue Services has branched out to help forensic science by training four dogs to find human remains. This specialist team of four handlers and dogs will be on call to help in murder enquiries and other incidents involving human remains. Mick Swindells has been featured in several British and Portuguese documentaries. He explains that what the dogs react to is totally intangible - likening it to a "fragrant soap" to the human nose. However, his greatest emphasis has been on the dog's inability to lie.

JOSE ANES (62) Year 2007 (Former-Director of Lisbon’s police laboratory)
Jose Anes, 62, blasted police procedures and said: “Mistakes in the early hours demolished the entire case.” The ex-director of Lisbon’s police lab highlighted the failure to seal off the McCanns’ holiday apartment after Maddie was reported missing on May 3. A series of blunders meant crucial evidence was lost forever. Remaining evidence was contaminated and made worthless. Mr Anes said: “If the scene is not preserved in the first hours, all the hours of effort that follow are useless. “I am utterly convinced — unless some new, concrete evidence suddenly emerges — the case will never reach trial.” He warned that even if it did go to court, a defence lawyer could easily get it thrown out because of doubts over contaminated evidence. Jose Anes is on the speaker's circuit for freemasons as a well-published author on the subject e.g. speaking at the "London Freeman' s Conclave ", of which he is a member, belonging to the Order of the "Holy Royal Arch Knights Tempar Priest/Order of Holy Wisdom.

On 29th November four members of the Portuguese investigation team met five experts from the Forensic Science Service (FSS) in Birmingham at Leicestershire Police headquarters to review and interpret the DNA results. The FSS had been conducting the tests for the Portuguese authorities for the last four months. Tests are said to have been conducted on blood samples, bodily fluids and hair found inthe Mrs McCanns' holiday apartment in Praia da Luz and in the car the couple hired 25 days after Madeleine disappeared on May 3. Leicestershire Police and the FSS both described the meeting as routine. A spokeswoman for the East Midlands force said: "Throughout the investigation there has been really good dialogue between the teams in Portugal and the UK but they felt it was a good time to sit down and talk face to face. They are not going to be interviewing anyone else. It is a routine meeting and then they will be going home." It is reported that Mark Williams-Thomas (a British ex-detective) also attended the meeting.

RICARDO PAIVA
At the meeting, the PJ relied on Ricardo Paiva, one of the investigation's main officers. He is not head of the inquiry, but the inspector from the Criminal Investigation Department (CID) in Portimao who is one of those who has been working closest with all the diligences. "He is, probably, the person who knows the process best", several sources with the investigation explained to Jornal de Noticias. This was not the first time that he had travelled to England for this case, as he worked with the British officers when they were in the Algarve supporting the investigation.

FERNANDO VIEGAS
Fernando Viegas is a technician from the Scientific Police Laboratory. He and Luis Viriato collected the residues that were found in the apartment and sent for testing at the Birmingham forensics laboratory last August.

LUIS VIRIATO
Luis Viriato is a technician from the Scientific Police Laboratory. He and Fernando Viegas collected the residues that were found in the apartment and sent for testing at the Birmingham forensics laboratory last August

FRANCISCO CORTE-REAL
Francisco Corte-Real, the vice-president of the National Institute of Legal Medicine, who in May coordinated the vast team at the Institute which performed tests on over three hundred bilogical traces that were found inside the apartment at Praia da Luz. His team performed the DNA tests on samples that were collected from the relatives and friends of the English couple and also from Robert Murat and his family. Corte-Real still follows the Maddie case, and he is often consulted by the investigators.