Nicky is one of the most competent, professional and passionate producers I have ever had the pleasure to work with. I worked with Nicky on Britain's Most Evil and World's Most Evil, where I was one of the expert contributors to the series. Nicky knows her subject material inside out and knows exactly the right questions to ask in order to bring out interesting and unique angles and perspectives. True crime is a difficult and challenging area to work in. It encompasses sensitive topics, ethical dilemmas and involves liaising with vulnerable people affected by homicide and violent crime. Nicky's down to earth and empathetic approach to her work is very impressive and is testament to her vast experience. She brings out the best in contributors, enabling everyone to tell their story whilst remaining sensitive to each individual's strengths and needs. I have been regularly appearing on true crime documentaries for many years now and have worked with a lot of different producers. I can honestly say that Nicky is one of the best - some of the conversations I have had with her have made me look at cases I've worked on in completely new ways.

Professor Elizabeth Yardley, Criminologist

I have had the pleasure of working with Nicky on several occasions.

She always knows her brief, has an excellent eye for detail and by her calm and personable manner always manages to get the best out of both individuals and the wider story.

She is receptive to ideas and quick-thinking in her reaction to developing facts.

She has produced some of the very best films in which I have been involved.

Colin Sutton

I have worked with Ms O Sullivan on several occasions and have always been impressed with her determination and dedication to the task she was responsible for. Whatever the project Ms O Sullivan will give 100% and as a result people will always trust and help her.

Clive Driscoll

Nicky O'Sullivan possesses an extraordinary talent. She contacted me by phone last year regarding one of my old and infamous Homicide cases in Sacramento involving Dorothea Puente, female serial murderer. She quickly introduced herself and explained the film project her company was looking at producing. She was so delightful to speak with and sincere in her words that I was good to go with being part of the film project. She answered all my questions and assured me that the production would be done well and complete.. Even though she was not going to be in Sacramento, California while this crime story was being filmed she advised me on the crew that would be. When I met the film crew at the house where the murders had occurred they were ready to go and were just great in setting up the interview scenario as Nicky explained. Nicky stayed in email and phone contact with me all the time before and after the filming, She always made sure I was good with everything being filmed. Never meeting her in person but trusting her word by phone conversation say's a lot about her character and worthiness.. She would later contact me again regarding another female killer I pursued by the name of "Batgirl". She would also set up this filming project with me by phone and email. She advised of the crew that would be in Sacramento doing the filming. The crew was outstanding as the others I met. The film project went well. I was so happy that Nicky had made sure everything was done right as she explained it would. Nicky has so much energy in her work. She is a great asset to any company she represents in my opinion. I've turned down other film company projects because they didn't seem to answer my questions. Nicky and I are now good friends even if it's by phone and email. She always asks about me and my family's well being. That itself means a lot to me. I am very protective about my family and personal life. It was so different with Nicky who made it seem we've been friends for decades..Hopefully we will meet someday if she has the opportunity to come to the United States...

John Cabrera, Retired Police Sergeant and former Homicide Detective for Sacramento Police Department

I had dealings with Nicky O'Sullivan in my role of Crime Expert commentating and providing narrative for a TV Series she was making. Nicky was a dynamic, organised, highly motivated and dedicated professional who thrived on challenge and making programs about crimes, I was very impressed by this amazing individual who gives her all to whatever role she is involved in.

DAVID SWINDLE - Crime Expert and Case Reviewer

Nicky is a knowledgeable and hardworking individual, she’s tenacious, reliable, dependable and intuitive. I’d recommend employing Nicky on either a team effort or lone project. Nicky delivers extraordinary work under pressure and in an efficient manner.

Jaimi West