Experts

This group of highly trained professionals bring together an accumulated 310 years of practical investigative and forensic analysis experience. Both independently and together, this group has authored five books, two chapters as invited authors and numerous technical articles.

Partners

Tom Bevel, MA, CCSR
405-447-4469
tbevel@bevelgardner.com

CPT Tom Bevel (Ret.) is President of Bevel, Gardner and Associates Inc. a forensic education and consulting company. He retired after 27 years with the Oklahoma City Police Department. His last assignment was the Commander of the Homicide, Robbery, Missing Persons and the Unsolved Homicide Units.

Captain Bevel (Ret.) holds a Master of Arts degree from the University of Central Oklahoma in the Administration of Criminal Justice. He is a graduate of the Scenes of Crime Course, Hendon, England; the Technical Investigations Course, Central U.S. Police Institute, Oklahoma State University at Oklahoma City, OK; the FBI National Academy, and the Post-Graduate Medical-Legal Course London Medical College, London, England.

Captain Bevel (Ret.) is a charter member of the FBI Scientific Workgroup on Bloodstain Pattern Analysis (SWGSTAIN) and served on the Board of Directors from 2002 through 2009; he is a Fellow of the Association For Crime Scene Reconstruction (ACSR); a Distinguished Member of the International Association of Bloodstain Pattern Analysts (IABPA); on the Editorial Board for the Journal of Forensic Identification; and a member of the Southwestern Association of Forensic Scientists (SWAFS); and the American Academy of Forensic Sciences (AAFS); he serves on the Board of Advisers for the Master of Forensic Science program for the University of Central Oklahoma. Mr. Bevel is the charter President for both the IABPA & ACSR and is a Distinguished Member of the IAI.

Captain Bevel (Ret.) has served as a crime scene consultant in over 46 U.S. States and 9 foreign countries. He has been qualified as an expert in crime scene reconstruction and bloodstain pattern analysis in both state and federal courts. 

Ross M. Gardner, MA
404-285-0217
rgardner@bevelgardner.com

Ross M. Gardner worked for the United States Army Criminal Investigation Command (USACIDC) as a felony criminal investigator for nearly twenty years. He retired as a Command Sergeant Major and Special Agent in 1999 after serving a total of 24 years in US Army law enforcement. Mr. Gardner subsequently served four years as the Chief of Police for the City of Lake City Georgia, a small suburban Atlanta police department. He is now retired and active in independent consulting.

Mr. Gardner holds a Master of Arts degree in Computer and Information Systems Management from Webster University, a Bachelors degree in Criminal Justice from Wayland Baptist University and Associates degree in Police Science from Central Texas College. He graduated first in his class at the Scenes of Crime Officers Course, New Scotland Yard, Hendon England in 1985 and between 1988 and 1996 served as an adjunct professor for Central Texas College in their police science program. He is a former President of the Rocky Mountain Association of Bloodstain Pattern Analysts (RMABPA), as well as the Association for Crime Scene Reconstruction (ACSR) and has served as the Chairmen of the Education Committee for both the RMABPA and the International Association of Bloodstain Pattern Analysts (IABPA). Mr. Gardner was recognized as a Distinguished Member of ACSR in 2006. He is a charter member of the FBI Scientific Workgroup on Bloodstain Pattern Analysis (SWGSTAIN) and served as the chairmen of the taxonomy and terminology subcommittee from 2002 until 2009.

Mr. Gardner was certified by the International Association for Identification as Senior Crime Scene Analyst over the period of 1990 to 2012. He is an active instructor and consultant throughout the United States in crime scene analysis, bloodstain pattern analysis and crime scene investigation; teaching to a variety of groups ranging from police and investigative organizations to trial counsel professional development groups. He is also author of the text Practical Crime Scene Processing and Investigation in 2004.

Tom "Grif" Griffin, BA, CSCSA, CBPA
tgriffin@bevelgardner.com

Tom “Grif” Griffin served 27 years with the Colorado Bureau of Investigation (CBI) as a criminal investigator and laboratory agent.  While there, he provided analysis and testified as an expert witness in Colorado district courts and/or federal courts in bloodstain pattern analysis (BPA), crime scene reconstruction (CSR), shooting incident reconstruction (SIR), and crime scene investigation (CSI) and in the forensic analysis of fire debris, controlled substances, and primer residue (GSR). Prior to working at CBI, he was a criminalist and crime scene investigator at the Greeley, Colorado Police Department for four years.  As a partner in BGA, he continues casework and testimony in BPA, CSR, and SIR and instructs BPA and CSR classes across the United States.

Griffin is International Association for Identification (IAI) certified as a Senior Crime Scene Analyst (CSCSA), a Bloodstain Pattern Analyst (CBPA), and a Crime Scene Reconstructionist (CCSR). He served several years as a member of the IAI Bloodstain Pattern Certification Board and now serves on the IAI Crime Scene Certification Board.  He is a member of the Organization of Scientific Area Committees (OSAC) Bloodstain Pattern Analysis Subcommittee and its Validation Task Group.  Grif was a charter member of the Scientific Working Group on Bloodstain Pattern Analysis (SWGSTAIN).  He has served as president of the International Association of Bloodstain Pattern Analysts (IABPA) and a Distinguished Member of that association.  Griffin has also served as president of the Association for Crime Scene Reconstruction (ACSR), the Rocky Mountain Division of the IAI, and the Rocky Mountain Association of Bloodstain Pattern Analysts (RMABPA), as well as participating on various committees for these associations. He is also a member of the Southwestern Association of Forensic Scientists (SWAFS), the United Kingdom’s Fingerprint Society (FPS), and the American Chemical Society (ACS).

Griffin is a founding member and past president of NecroSearch, International, a group dedicated to the detection of clandestine graves and serves as a permanent member of its board of directors. He has co-authored articles on the detection of clandestine graves, the investigation of mass crime scenes, and analysis of bloodstain patterns. He has instructed at bloodstain pattern workshops for the annual IAI educational conferences. He has been featured speaker for presentations in Canada, the United Kingdom, the People’s Republic of China, and throughout the United States. He also regularly instructs on various aspects of crime scene investigation at law enforcement academies in Colorado. Grif also continues to participate in seminars and training programs to keep abreast of advancing techniques and technologies. 

Craig Gravel, MA, CBPA
rcgravel@bevelgardner.com

Craig Gravel is a retired Lieutenant with the Oklahoma City Police Department. During his 25 years of service at the Department, he was assigned to the Investigations Bureau serving as a detective in the Larceny, Missing Persons, Robbery and Homicide Units. He was promoted to the rank of Lieutenant in 1998, and served as a supervisor in the Crime Scene Unit for the 10 years preceding his retirement.

Craig holds a Masters of Arts Degree in Criminal Justice Administration and a Bachelor of Science Degree in Education from Oklahoma City University. He has nineteen years of experience and advanced training in Bloodstain Pattern Analysis. Gravel is a certified Bloodstain Pattern Examiner through the International Association for Identification.

He has been an Adjunct Professor at the University of Central Oklahoma since 2002, instructing Basic and Advanced Bloodstain Pattern Analysis in the Master of Forensic Science Program. He served on the University of Central Oklahoma’s, Master’s of Forensic Science Advisory Board. He has also taught at the University of Oklahoma and Oklahoma State University. Craig has lectured on Bloodstain Pattern Analysis for various organizations such as the F.B.I, Regional Organized Crime Information Center, Oklahoma Bureau of Investigations and the Smokey Mountain Criminal Justice Conference. He has fifteen years of teaching and lecturing experience.

Craig is a charter member of the Association for Crime Scene Reconstruction, where he has served as a board member from 2004/2006 He is a member in good standing with the International Association of Bloodstain Pattern Analysis, International Association for Identification, Oklahoma Division of the International Association for Identification and the International Association of Crime Analysts. Craig is certified by The IAI as a Bloodstain Pattern Examiner. 

Jonathyn Priest
jpriest@bevelgardner.com

Jonathyn “Jon” Priest is a thirty-one year veteran of the Denver Police Department in Colorado. He has over twenty-seven years of experience investigating thousands of criminal incidents of violence as a detective, supervisor, and command officer.

He is a Court recognized expert in Colorado District Courts and U.S. Federal Courts in bloodstain pattern interpretation, crime scene and shooting incident reconstruction, death investigation, and major case management. In addition to criminal testimony, he testifies and consults in civil cases in the area of death investigation and major case management.

He has extensive background in the area of death investigation and officer-involved critical incident investigation. Jon developed the Denver Police Department’s investigation protocol and training curriculum in the area of death investigation, officer-involved critical incidents, and interview and interrogation. He also has a great deal of experience in the area of video documentation of criminal incidents. He trains law enforcement officers on a state and national level in these disciplines. He regularly consults with the District Attorney for the Second Judicial District as well as the Denver City Attorney in the area of criminal investigation.

He is a member of the following professional organizations:

• Association for Crime Scene Reconstruction (ACSR)

• International Association of Blood Stain Pattern Analysts (IABPA)

• International Association for Identification (IAI)

• Rocky Mountain Association of Bloodstain Pattern Analysts (RMABPA)

• International Homicide Investigators Association (IHIA)

• The American College of Forensic Examiners (ACFEI)

He has a certification from the International Association for Identification (IAI) as a Bloodstain Pattern Examiner (CBPE), a certification from the American College of Forensic Examiners (ACFEI) as a medical investigator (CMI-III), and is a board member of the Association for Crime Scene Reconstruction (ACSR). 
 

Associates

Kenneth F. Martin, BA, MS, CLPE, CBPA, CFWE, CSCSA
405-447-4469
kmartin@bevelgardner.com

Kenneth Martin is a retired Detective Lieutenant from the Massachusetts State Police.  He was a member of the department for almost thirty-three years at the time of his retirement.  Detective Lieutenant Martin was the Commanding Officer of the Crime Scene Services Section of the MSP Forensic Services Group, which is accredited by ASCLD-Lab under the ISO-17025 program. He conducted casework in and supervised the disciplines of crime scene response and evidence collection, latent print examination, shoe and tire track examination, and bloodstain pattern evidence conducted by the CSSS of the MSP statewide laboratory system. Mr. Martin also served as the Quality Assurance Manager for the Latent Fingerprint Section of the New York City Police Department for two years.  

Mr. Martin is a past president of the International Association for Identification and is presently the IAI’s representative to the Consortium of Forensic Sciences.  In addition to lecturing to various audiences and having been published, he is certified by the International Association for Identification as a Footwear Examiner, Bloodstain Pattern Examiner, and Senior Crime Scene Analyst. He has served as a member of various working groups including the General Forensics Technology Working Group, the Office of Law Enforcement Technology Commercialization, and the Scientific Working Group on Friction Ridge Analysis, Study and Technology.

Mr. Martin has also served as a member of Scientific Working Group on Bloodstain Pattern Analysis, the NIJ/NIST Expert Working Group on Human Factors in Latent Print Analysis, and the International Association of Chiefs of Police Forensic Science Committee. Mr. Martin has a B.A. in Biology; a B.S. in Criminal Justice; a M.S. in Criminal Justice and is a graduate of the FBI’s National Academy 192nd session. He is an adjunct instructor in the graduate forensic biomedical program at Boston University’s School of Medicine and has been certified by the Massachusetts Municipal Police Training Committee as a Level III Instructor in Investigative Techniques.  Currently he is working as a private examiner conducting casework and training in the disciplines of latent print, footwear/tire track, crime scene, and bloodstain pattern analysis. 

Kim Duddy, CSCSA
kimduddy@bevelgardner.com

Kim Duddy retired from the Washington State Patrol Crime Laboratory with over 28 years of experience as a Forensic Scientist with expertise in crime scene reconstruction, bloodstain pattern analysis, and shooting incident reconstruction.  As well, her expertise also encompassed the analysis and comparison of evidence in many of the sub-disciplines of Trace Evidence.  Ms. Duddy was the Supervisor of the Microanalysis Section for eight years and the Firearms and Toolmarks Section for two years.  Ms. Duddy has been qualified as an expert witness in crime scene reconstruction, bloodstain pattern analysis, shooting incident reconstruction, and trace evidence analysis in Washington courts and has been an expert witness in Frye and inquest hearings.

Ms. Duddy holds a Master of Science degree in Forensic Science from the University of New Haven, a Bachelor of Science degree in Geology from the University of Rhode Island, and an Associates degree in General Studies from Montgomery County Community College.  She was an adjunct professor for the University of New Haven in their forensic science program.

Ms. Duddy is certified by the International Association of Identification as a Senior Crime Scene Analyst.  She was certified as a Diplomate by the American Board of Criminalistics until 2009.  Ms. Duddy is a member of the Association for Crime Scene Reconstruction and has been the President twice, served as a Board member, and Chair of the Ethics Committee.  Ms. Duddy is a Distinguished Member of ACSR. Ms. Duddy is a member of the International Association of Bloodstain Pattern Analysts and served on the Education Committee. She is also a member of the International Association for Identification, the Rocky Mountain Association of Bloodstain Pattern Analysts, the Northwest Association of Forensic Scientists, and previously the Pacific Northwest Division of the IAI. Ms. Duddy is a current affiliate member of the Organization of Scientific Area Committees (OSAC) in the crime scene investigations subcommittee.

Ms. Duddy instructed numerous classes and workshops to law enforcement groups, medical examiner’s offices, and trial counsel groups on physical evidence recognition, documentation, and collection; crime scene processing; and bloodstain pattern analysis during her tenure with the WSPCLD.  Ms. Duddy continues to instruct in bloodstain pattern analysis and crime scene reconstruction. Ms. Duddy was the forensic technical advisor and trainer for a regional Multiagency Investigative Response Team (MIRT).

Celestina Rossi
Celestina.Rossi@mctx.gov

Celestina Rossi is the Senior Crime Scene Investigator with the Montgomery County Sheriff’s Office Crime Laboratory in Conroe, Texas.  She has a Master Peace Officer’s License with 21 years of law enforcement experience.   Since her promotion to the crime laboratory in 2002, she has been court-qualified as an expert in latent print examination, bloodstain pattern analysis, crime scene reconstruction, and shooting incident reconstruction.

Cele is an Adjunct Instructor for the Texas Forensic Science Academy at the Texas A&M Engineering Extension Service (TEEX), where she teaches multiple courses that include Forensic Technician (80 hrs.), Bloodstain Pattern Analysis, and Processing Evidence of Violent Crimes. She is also an Adjunct Assistant Lecturer at Texas A&M University in College Station, Texas, in the Forensic and Investigative Sciences Program, Department of Entomology. She teaches two mini-semester courses in Crime Scene Investigation and Latent Print Processing.

Cele is the Secretary of the Texas Division of the IAI, where she has served since 2006. She is a Southeast Texas Applied Forensic Science Facility (STAFSF) Operations Committee board member at Sam Houston State University. She is also a past President of the Association of Crime Scene Reconstruction and The International Association of Bloodstain Pattern Analysts. 

Casson Reynolds, BA, MS, CLPE, CBPA, CFWE, CSCSA
405-447-xxxx
xxxx@bevelgardner.com

Casson Reynolds is the Instructor/Developer and Subject Matter Expert in Crime Scene Investigations and Reconstruction with the North Carolina Department of Justice at the North Carolina Justice Academy since 2017.  He is a Senior Crime Scene Analyst through the International Association for Identification, in the presidential succession for the Association for Crime Scene Reconstruction from 2023 to 2025, in the presidential succession for the North Carolina International Association for Identification from 2022 to 2025, and Board Member on the Bloodstain Pattern Analysis Subcommittee of the American Academy of Forensic Science Standards Board from 2018 to 2028.  

Casson teaches courses in crime scene investigations, crime scene reconstruction, advanced documentation, photography, shooting reconstruction, bloodstain pattern analysis, courtroom testimony, search and seizure, and property & evidence management.  

Casson has a Master of Science from Boston University and was a sworn law enforcement officer from 2003 to 2017. Most of that time was spent in a crime scene or forensic unit. Casson has been recognized as a subject matter expert in state court in Crime Scene Reconstruction, Shooting Incident Reconstruction, Bloodstain Pattern Analysis, and Latent Print Development and Identification.  

Casson is an adjunct professor at the University of North Carolina at Wilmington, a Certified General Instructor, a Certified Advanced Law Enforcement Officer, and an Advanced Gang Investigator.