Protecting Vulnerable in Puget Sound Since 2000 206 229 7984 Email Us



Licensed Private Investigator Agency Principal

  • May 2015 – Present
  • Infinium Investigations Inc, 6947 Coal Creek Pkwy SE #327, Newcastle, WA 98059
  • May 2015, Founded Infinium Investigations Inc, an Independent Private Investigation Agency serving Puget Sound.

Contracted Therapist/Clinician

  • May 2016 – Present
  • Infinium Investigations Inc./Working Choices Inc. Bellevue, WA. Immediate Clinical Intervention for families in crisis, experiencing adversarial interphase from Child Protective Services, when child placement is imminent, or during a parent-child reunification.

Investigator Adult Protective Services

  • Oct 2014 – Oct 2015
  • Washington State-ALTSA-DSHS-APS, Seattle WA
  • Investigated abuse, neglect and financial exploitation of vulnerable adults in King County.

Clinical Health Care Assessor

  • Mar 2012 – Sep 2014
  • Washington State-HCS-ALTSA-DSHS, Seattle WA
  • Clinically assessed/monitored Medicaid/Medicare clients receiving state services in skilled nursing facilities, then facilitated safe and responsible discharge planning to the community.

Social Worker Adoptions/Permanency Unit

  • Mar 2009 – Feb 2012
  • Washington State-CA-DCFS-DSHS Seattle, WA
  • Recruited to elite team of adoption/permanency social workers managing cases of high conflict, politically-sensitive legally-free-to-adopt foster children.

Child Protective Services Investigator

  • Mar 2006 – Aug 2009
  • Washington State – DSHS-CA, Kent, WA
  • Expertly trained at interviewing abused and neglected children, efficiently maximizing the information gained, while minimizing further trauma.

Juvenile Rehabilitation Residential Counselor

  • Jan 2000 – Jan 2005
  • Washington State-DSHS-JRA-Echo Glen, Snoqualmie, WA
  • Provided supervision, counseling, and management for adjudicated male offenders, aged 12-16 years, in mental health setting.

University of WA School of Social Work

  • Sep 2003 – Jun 2006
  • Seattle, WA
  • MSW Masters Degree of Social Work: Specialty in Administration and Clinical Social Work Awarded academic scholarship.

University of Washington

  • Sep 1996 – Jan 1999
  • Seattle
  • BA Bachelors of Sociology

Community Involvement

  • King County Superior Court Family Law Court-Appointed Special Advocate (CASA)
  • Head Coach for 10U Newcastle Pony League Baseball 2012-
  • 2012-2015 Head Coach: Arena Sports U10:
  • 2013-2015 Head Coach Newport Soccer
  • 2013-2015: U10 NYSC Head Soccer Coach: Thunderbolt F.C.
  • 2012-2016 Classroom volunteer at Issaquah School District


  • PI Licensed Private Investigator: Armed Private Investigator Principal license Cert# 4157. Agency License # 2199
  • ACSW Academy of Certified Social Workers, License #886673932
  • QCSW Qualified Clinical Social Worker, #886673932
  • LICSW Licensed Indep. Clinical Social Worker LW 60265039
  • LASW Washington State Department of Health LW 60338539
  • Certified Process Server License, King County #1619601
  • Registered Notary #183098


  • Washington Association of Legal Investigators
  • Association of Certified Fraud Examiners
  • American Society of Industrial Security member
  • King County Bar Association
  • National Association of Social Workers (ACSW & QCSW)
I have worked with Erik Larson for the past three years within the Department of Social and Health Services. We have worked together on many challenging cases and he has always presented as competent, efficient and reliable. He was eager to assist me with any concerns or recommendations I had regarding our mutual clients. I would highly recommend using Erik Larson for his excellent customer service and communications skills.
─ Dekel Zuhri, Owner/Manager at Positive Awakenings LLC
Erik is a true professional. His work was always thorough and detailed. I would not hesitate to recommend his services.
─ Marci Comeau Murphy, Attorney at Law.
I have had the pleasure of working with Erik Larson, regarding my mother's safety and care prior to her passing, and currently in regard to an investigation involving potential financial fraud and exploitation. Erik is outstanding in his work and a true professional! He is dependable, circumspect, competent, compassionate, considerate, resourceful, timely, trustworthy, ethical, and has passion for his work.I highly recommend Erik to anyone needing his expertise and professional services.
─ Ann Beardsley, Jafra District Manager
As an adoption attorney, I always looked forward to working with the families on Erik Larson's caseload. Erik is always conscientious, making sure to send me exactly what I needed for each adoption...and when an unexpected issue would arise, Erik was responsive, diligent and was always going above and beyond the call to ensure the adoption would occur in a timely manner. I wish Erik still worked in Adoptions, but with his attention to detail, high level of professionalism as well as the ability to think quickly on his feet, I know Erik will be successful in whatever he does. I HIGHLY recommend Erik Larson for your legal project.
─ Andrew Schneidler,Founding Attorney, Children's Law Center of Washington, PS