Justin is the Founder and CEO of acceligence, a management consulting firm focused on technology, cybersecurity, risk, and strategy. Justin helps executives and boards of the world’s leading organizations optimize their technology investments and transform risk into competitive advantage.

Prior to acceligence, Justin led the North America Cybersecurity Practice at McKinsey & Company, serving technology executives, the c-suite, and boards across a variety of industries, to protect their most critical assets while helping them go faster with confidence. He works closely with technology and cybersecurity providers and investors on strategy, growth, and go-to-market programs that build market leadership and yield tangible results.

Before McKinsey, Justin built, scaled, and led numerous global practices within EY‘s (Ernst & Young) cybersecurity, technology transformation, and digital divisions. He was also a senior consultant with Protiviti in Paris, and before that, he led the technology organization of a public sector consulting group. Justin began his career as a tech entrepreneur, founding a digital consulting company that designed, built, and implemented digital solutions.

Justin served on the faculty at Indiana University Kelley School of Business, where he taught award-winning courses on IT governance, risk, and controls in the MSIS and MBA programs. A strong believer in the power of education, Justin founded a scholarship focused on providing higher education opportunities to students in need.

Justin is a frequent speaker at industry conferences and various executive and board forums. He publishes frequently on topics such as technology strategy, cybersecurity, technology risk, and digital transformation. Justin earned a bachelor of science and an MBA from Indiana University, Bloomington; an executive certificate from Harvard Business School, and holds the following professional certifications: CDPSE, CGEIT, CIPP/US, CISA, CISM, CISSP, CRISC, GIAC/GSEC, ITIL, PMP, and TOGAF.

Justin lives in the Chicago suburbs and serves as a Trustee on the Executive Committee and Chairs the Audit and Risk Committee at Ravinia. Justin is also a member of the Dean’s Council at Indiana University’s Kelley School of Business. He is a proud father of two amazing kids, and has a list of hobbies and interests that only seems to be growing.

Justin writes frequently at JustinGreis.com where he shares professional insights and personal stories from work, life, and everything in between.

acceligence, Founder and CEO

McKinsey & Company, Partner and North America Cybersecurity Leader

Kelley School of Business, Indiana University, Bloomington, Faculty Member

Ernst & Young (EY), Partner and Practice Leader

Partner, Global and North America Cybersecurity Practice

Founding Partner, Digital and Emerging Technologies Practice

Partner, Technology Transformation Practice

Protiviti, Senior Consultant

BrainOrbit, Founder and CEO

Kelley School of Business, Indiana University, Bloomington, Master of Business Administration (MBA)

Kelley School of Business, Indiana University, Bloomington, Bachelor of Science (BS)

Harvard Business School, Harvard University, Executive Certificate

Certified Information Systems Auditor® (CISA), ISACA

Certified Information Security Manager® (CISM), ISACA

Certified in Risk and Information Systems Control™ (CRISC), ISACA

Certified Data Privacy Solutions Engineer™ (CDPSE™), ISACA

Certified in the Governance of Enterprise IT® (CGEIT), ISACA

Certified Information Systems Security Professional (CISSP), ISC2

Certified Information Privacy Professional/United States (CIPP), IAPP

GIAC Security Essentials Certification (GSEC), SANS Institute

Information Technology Infrastructure Library (ITIL)

TOGAF® 9 Certified, The Open Group

Project Management Professional (PMP)®, PMI

Cybersecurity Credential, McKinsey & Company

Knowledge & Capabilities Gold Credential, McKinsey & Company

Digital & Analytics (DnA) – Tech Resiliency & Cybersecurity, McKinsey & Company

All In, Diversity & Inclusion (ADI) Gold, McKinsey & Company

Innovation Olympics Silver Badge (2025), McKinsey & Company

Innovation Olympics Bronze Badge (2024), McKinsey & Company

Recruiting Gold Credential, McKinsey & Company

Knowledge & Capabilities Gold Credential, McKinsey & Company

National Association of Corporate Directors (NACD), Member