Director of Toxicology
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About this role
Location: This position may be performed remotely, but requires the flexibility and willingness to travel as needed.
The Opportunity
As Director, Toxicology, you will provide scientific, strategic, and regulatory leadership for nonclinical safety activities across Praxis’s growing portfolio of novel small molecule and antisense oligonucleotide (ASO) therapies for CNS disorders.
You will own toxicology strategy for designated programs and lead nonclinical safety activities from discovery and candidate selection through IND-enabling development and toward NDA/MAA. You’ll provide hands-on scientific leadership, interpret emerging safety findings, and translate complex data into clear recommendations for program teams, leadership, and regulatory authorities.
You’ll thrive in this role if you bring deep toxicology expertise, strong regulatory judgment, and an ownership mindset. You anticipate risks, challenge assumptions, navigate ambiguity, and develop pragmatic paths forward—helping Praxis advance promising medicines to patients with speed and scientific rigor. As the function grows, the Director may assume responsibility for leading and developing direct reports by establishing clear priorities, providing scientific guidance and constructive feedback, and creating opportunities for increased ownership and professional growth.
Primary Responsibilities
• Own nonclinical safety strategy for assigned programs, ensuring toxicology plans support candidate selection, IND-enabling development, clinical progression, and later-stage regulatory milestones.
• Design and oversee discovery, exploratory, investigative, and regulatory toxicology studies, including non-GLP and GLP studies, from protocol development through interpretation and final reporting.
• Evaluate emerging safety findings, assess their relevance to human risk, and recommend clear, pragmatic paths forward for development teams.
• Lead regulatory toxicology activities, including contributions to INDs, CTAs, IBs, DSURs, NDA/MAA-related documents, and responses to FDA and other global health authority questions.
• Direct CROs, consultants, and other external partners, holding them accountable for scientific quality, compliance, timelines, and transparent communication.
• Partner across Discovery, DMPK, Bioanalytical, Clinical Pharmacology, Regulatory, Clinical, and other functions to integrate nonclinical safety into program strategy and decision-making.
• Represent Nonclinical Safety Assessment on cross-functional teams, communicate risks and recommendations clearly, and help ensure the right decisions are made with speed, rigor, and patient impact in mind.
Qualifications and Key Success Factors
• Master's degree or PhD preferred in Toxicology, Pharmacology, Pharmacy, Biology, or a related scientific discipline. DABT certification is desirable.
• 8+ years of relevant biotechnology, pharmaceutical, CRO, regulatory agency, or combined experience, with meaningful responsibility for nonclinical safety programs and significant experience directing or monitoring toxicology studies.
• Deep expertise in general toxicology and the design, conduct, interpretation, and reporting of nonclinical safety studies. Experience in reproductive toxicology, genetic toxicology, safety pharmacology, carcinogenicity, and/or abuse potential assessm
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