– INTERIM & VIRTUAL STAFFING
Interim CISO
Executive-Level Security Leadership, On Demand. Strategic cybersecurity guidance for executives and boards. Leadership understanding of evolving threats and risk posture. Support governance, compliance, and accountability across the enterprise.
Strategic guidance that turns complex cyber threats, regulatory demands, and risk exposures into clear, actionable insights for the boardroom. Our Virtual CISO service equips leaders to navigate shifting threat landscapes, compliance obligations, and business priorities, while advising on the policies, controls, and oversight practices that build cyber resilience and protect long-term organizational value.
Continuity. Stability. Leadership. When It Matters Most.
Transitions in cybersecurity leadership can leave your organization vulnerable at a time when clarity and continuity are critical. Eristotle’s Interim CISO Services provide experienced, strategic leadership to maintain momentum, manage risk, and ensure operational integrity during periods of change.
Whether you’re between ISOs, building the function from scratch, or redefining the role, our interim ISOs bring immediate capability, credibility, and confidence to your security program. Eristotle’s Interim ISO offering is a flexible, executive-level engagement designed to provide immediate leadership in your cybersecurity program. Our seasoned ISOs step into your organization to lead, stabilize, and evolve your security function while you search for a permanent leader or navigate an organizational shift.
Acting as an embedded executive or strategic advisor, the Interim ISO ensures governance remains intact, security initiatives stay on track, and executive teams remain supported during the transition.
Aligned to ISOBOK™ – A Consensus Driven Standard
ISOBOK™ is developed through a rigorous consensus-driven standards development process and incorporates the collective wisdom and experience of experts in the field from around the world. It defines the skills and knowledge required by ISO professionals.
- Contains a description of generally accepted practices for the establishment of Information Security Offices.
- Community driven and consensus based, continuously updated through iterations.
- Techniques are transferable with option to modify concepts and best practices for wide range of organizational contexts.
- Includes the highly valued Reporting Framework.
1. Security Leadership
- Defines the ISO’s role, competencies, and mindset, including the different types of ISOs.
- Establishes the security organisation’s structure, charter, and board-level mandate.
- Aligns with industry standards and frameworks to develop a comprehensive security strategy.
- Covers setting up budgets, initiating security programs, and embedding the function into enterprise governance.
2. Security Culture
- Emphasizes that humans are the final line of defense and central to effective security.
- Promotes a human-centric approach through awareness, training, and behavior-shaping initiatives.
- Uses phishing simulations, access hygiene practices, and continuous reinforcement to improve behaviors.
- Encourages a feedback-driven culture of continuous improvement and user engagement.
3. Security Governance
- Establishes governance through policies, frameworks, ISMS, and the 3 Lines of Defense model.
- Defines risk management approaches, including qualitative/quantitative methods, tolerance, and appetite.
- Integrates compliance, audit, and control mechanisms to align security and business risk.
- Addresses fraud prevention, governance councils, and harmonization between compliance and security.
4. Security Advisory
- Advises on security trends, frameworks, and standards, supporting strategic and operational decisions.
- Applies a layered defense model and reviews risks across technology domains.
- Offers guidance on integrating emerging technologies and securing IT/OT environments.
5. Security Operations
- Aligns security operations with business goals through a service-based SOC model.
- Plans and executes incident and crisis management using structured detection and response frameworks.
- Defines SOC team roles and leverages platforms like SIEM, SOAR, and threat intelligence tools.
6. Security Reporting
- Delivers tiered reporting for operational, management, and board-level audiences.
- Ensures regulatory, legal, and external stakeholder reporting meets compliance obligations.
- Uses KPIs, KRIs, dashboards, and threat intelligence to communicate performance and risk posture.
- Follows best practices for effective, actionable, and transparent security reporting.
Key Objectives
- Provide experienced security leadership during periods of executive turnover, absence, or restructure
- Maintain and enhance cybersecurity operations, strategy, and governance during the transition
- Identify quick wins, risk areas, and strategic priorities to stabilize the program
- Support the onboarding or hiring of a permanent ISO with continuity and institutional knowledge
- Define or refine the scope, mandate, and reporting structure of the ISO role within your enterprise
Business Outcomes & Benefits
- Continuity of Cyber Leadership Avoid disruption by maintaining executive oversight of critical cyber risk, compliance, and response functions.
- Trusted Strategic Guidance Get access to a veteran security leader who can quickly assess your environment and take decisive action.
- Accelerated Organizational Maturity Drive quick improvements in governance, policy, threat response, and stakeholder alignment, even in transition.
- Support for Permanent CISO Hiring Receive assistance in defining the ISO role, participating in interviews, and enabling a smooth handover.
- Executive Presence and Board Communication Maintain credibility with regulators, stakeholders, and boards with experienced leadership at the helm.
Key Features
- Flexible Engagement Models Options for full-time, part-time, remote, or hybrid leadership depending on your needs.
- Immediate Executive Integration Rapid immersion into your governance structure, team dynamics, and ongoing initiatives.
- Security Program Oversight Oversight of SOC operations, incident response, compliance programs, and transformation projects.
- Governance and Reporting Establishment or refinement of metrics, dashboards, board communications, and audit readiness.
- Mentorship and Team Development Coaching and upskilling for internal security personnel and cross-functional teams.
Deliverables
- Interim CISO Charter Defined objectives, responsibilities, and success metrics for the engagement period.
- Current State Assessment High-level review of your security posture, program maturity, and critical risks.
- Stabilization Plan Immediate actions to address urgent priorities and maintain continuity.
- CISO Role Definition Support Guidance on the scope, reporting lines, and strategic mandate for your next permanent CISO.
- Transition and Exit Report Documentation of progress, open issues, and recommendations for continued success post-engagement.
How We Deliver
Eristotle’s Interim CISOs are executive-caliber professionals with proven experience in regulated industries, global enterprises, and high-risk environments. Our delivery model includes:
- Rapid onboarding and stakeholder engagement
- Situational analysis and priority planning
- Interim program management and reporting
- Handover to incoming CISO or permanent team
We tailor the engagement to your organization’s needs, whether it’s 30, 60, 90 days or a longer-term leadership bridge.
Need Strong Cyber Leadership Now?
Don’t leave your security function exposed during a transition. Engage Eristotle to provide interim CISO leadership that protects, aligns, and accelerates.