Leading the development, maintenance, and continuous improvement of ISCC certification frameworks related to Chain of Custody approaches, including Book & Claim systems across SAF, alternative marine fuels, and road transport fuels, ensuring alignment with evolving regulatory and voluntary market requirements, Monitoring global regulatory and voluntary frameworks and assessing their implications for ISCC certification schemes, while developing proactive system responses and improvements, Researching, developing, and refining Chain of Custody methodologies in close collaboration with industry stakeholders, ensuring robustness, auditability, and practical market applicability, Building, maintaining, and further developing IT infrastructure, registry systems, and digital tools supporting Book & Claim and Chain of Custody operations, Liaising with global policymakers, regulators, and standard-setting bodies, including SBTi, GHG Protocol, EU institutions, ICAO CORSIA, and other relevant frameworks on Chain of Custody approaches, including Book and Claim, Developing and maintaining governance and integrity frameworks for ISCC systems, including eligibility criteria, claim rules, and mechanisms to prevent double counting, Designing and implementing corrective measures and safeguards to ensure a high-integrity certification and registry system, Building and strengthening relationships across the sustainable fuels value chain, including fuel producers, suppliers, traders, airlines, shipping companies, and corporate users, Designing, delivering, and supporting training programmes for certification bodies, auditors, system users, and regulators, Representing ISCC at international conferences, industry events, and stakeholder workshops as a subject matter expert, Developing presentations, technical papers, and communication materials to support thought leadership in sustainable fuels and Chain of Custody systems