The Physician Assistant - Clinical Research Sub-Investigator supports the safe, compliant, and efficient conduct of clinical trials under the oversight of the Principal Investigator. The role combines advanced clinical assessment with protocol execution, participant safety surveillance, source documentation, and cross-functional coordination. The PA serves as a medically qualified member of the investigator team and helps ensure that study-related medical care and decisions are timely, appropriately documented, and consistent with the protocol, Good Clinical Practice (GCP), applicable regulations, the IRB-approved plan, sponsor requirements, and organizational procedures. This role does not replace the PI and does not independently assume responsibilities reserved to the PI, the sponsor, the IRB, or another licensed professional. Authority is study-specific and begins only after required credentialing, training, sponsor acceptance where applicable, and documentation on the delegation-of-authority log. Minimum Qualifications Graduate of an accredited Physician Assistant program; master's degree or higher preferred/required in accordance with applicable licensure standards. Current, unrestricted Physician Assistant license in each state where assigned clinical services will be performed. Current NCCPA certification, if required by state law or organizational policy. Current Basic Life Support certification; Advanced Cardiovascular Life Support certification required when appropriate to the study population, procedures, or site emergency plan. DEA registration and state controlled-substance authorization when required for assigned prescribing or study responsibilities. At least two years of direct patient-care experience preferred; experience in the site's therapeutic areas strongly preferred. Clinical research experience preferred. Candidates without prior research experience must demonstrate the ability to complete structured research, GCP, protocol, and system training before independent task assignment. Demonstrated ability to evaluate clinical information, recognize safety concerns, document sound clinical reasoning, and escalate appropriately. Proficiency with electronic medical records and ability to learn CTMS, eSource, EDC, safety, laboratory, and sponsor systems. Ability to communicate clearly with participants, investigators, staff, sponsors/CROs, and healthcare providers.Required Knowledge and Competencies Participant Safety: Recognizes clinical risk, responds with appropriate urgency, and prioritizes participant rights, safety, and well-being. Clinical Judgment: Integrates medical history, examination findings, laboratory data, concomitant medications, and protocol criteria within delegated authority. GCP and Regulatory Compliance: Understands investigator-site obligations, informed consent, safety reporting, protocol adherence, privacy, and essential documentation. Documentation and Data Integrity: Produces timely, accurate, traceable records and resolves discrepancies without obscuring the original record. Protocol Discipline: Follows current approved materials and does not improvise around eligibility, dosing, safety, or endpoint requirements. Escalation and Accountability: Recognizes role boundaries, communicates concerns early, follows issues to resolution, and accepts ownership of assigned actions. Operational Reliability: Manages scheduled visits, review queues, signatures, queries, and follow-up within required timelines. Collaboration: Works effectively across clinical, regulatory, pharmacy, laboratory, recruitment, quality, and sponsor/CRO teams.