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Definium Therapeutics is a late-stage clinical biopharmaceutical company and our mission is to forge a new era of psychiatry by applying scientific rigor to psychedelics, with the goal of developing accessible treatments that unlock healing at scale.   Our lead product candidate, lysergide tartrate (our proprietary orally disintegrating tablet form of lysergide (LSD) D-tartrate), represents a highly differentiated, potential best-in-class opportunity for patients suffering from generalized anxiety, major depressive disorder, and posttraumatic stress disorder. Our early stage pipeline includes DT402, the R-enantiomer of MDMA and is under development to target the core symptoms of autism spectrum disorder (ASD), specifically addressing social communication challenges.      Guided by the recognition that patients deserve more than better, Definium is relentlessly advancing a new generation of therapeutics intended to address the underlying causes of psychiatric and neurological disorders. By turning evidence into impact, Definium aims to change the trajectory of today’s mental health care crisis and enable a healthier future. Headquartered in New York, Definium Therapeutics trades on Nasdaq under the symbol DFTX.  Together we are moving psychiatry forward—beyond better, into a boundless future. Join us!   The Senior Medical Science Liaison (MSL) will serve as a field-based scientific and clinical expert for our psychiatry portfolio, building and maintaining strong relationships with Key Opinion Leaders (KOLs), healthcare providers, policy influencers, and other stakeholders. This role will focus on engaging the medical community to communicate scientific data, provide clinical insights, and ensure that our research and development efforts align with real-world practice needs. Additionally, this role will also help shape internal resources, training, and capabilities for the broader Field Medical Function The ideal candidate will have a deep understanding of psychiatric disorders, a passion for science-driven conversations, and the ability to operate effectively in a small, fast-growing biotech environment. Responsibilities Medical Affairs & Scientific Engagement Identify, develop and maintain trusted relationships with KOLs, clinical investigators, and key stakeholders across academic and clinical psychiatry Serve as the primary medical resource in the field, delivering accurate and balanced scientific information about our programs to facilitate high-quality scientific exchange Support scientific education at national and regional psychiatry conferences, advisory boards, and educational events Gather and communicate field insights to internal stakeholders to inform strategy and decision-making Provide clinical and scientific input to cross-functional teams, including R&D, Clinical Development, and Commercial Respond to unsolicited requests for medical information from healthcare professionals Monitor and report on competitor landscape Support clinical teams as needed with clinical trial site identification enrollment initiatives Support investigator-initiated trial (IIT) and Phase IV trial activities as needed Ensure all interactions are conducted in accordance with company policies, regulatory guidelines, and compliance requirements Government Affairs, Advocacy and HEOR Serve as point person as needed with Government Affairs and HEOR to provide scientific and clinical expertise in policy discussions, public comment submissions, and stakeholder briefings Support Government Affairs and Patient Advocacy in identifying and maintaining relationships with relevant government agencies, policymakers, and advocacy groups in mental health and psychiatry Oversee creation of specific slide decks and training materials for state and federal government policymakers