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Principal investigator
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Principal investigator (PI) refers to the person(s) in charge of a clinical trial or a scientific research grant. The principal investigator prepares and carries out the clinical trial protocol (plan for the study) or research paid for by the grant. The principal investigator also analyzes the data and reports the results of the trial or grant research.

Sourced From
National Cancer Institute (NCI) Dictionary of Cancer Terms
NIH Clinical Research Trials and You:

Synonyms:
PI
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  • Principal investigator
    A principal investigator (PI) is the researcher, usually a doctor or other medical professional, who leads the clinical research team and, along with the other members of the research team, regularly monitors study participants’ health to determine the study’s safety and effectiveness. A PI is primarily responsible for the preparation, conduct, and administration of a research grant, cooperative agreement, or other sponsored project in compliance with applicable laws and regulations and institutional policy governing the conduct of clinical research.

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    NIH Clinical Research Trials and You: Glossary of Common Terms
    NCImetathesaurus

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