Meet our Leadership Team

Paul Lewis

Paul Lewis

CEO & FOUNDER

Paul Lewis

CEO & FOUNDER

Paul is a serial cybersecurity entrepreneur with more than 30 years in the industry. Formerly the Founder and CEO of PG Lewis LLC, a cyber security and data forensics company that was strategically acquired by Robert Half International (NYSE:RHI), and the Founder and CEO of MC2, a data security company that was strategically acquired by Volt Information Sciences (NYSE:VOL), Paul's been granted numerous patents to advance data privacy and protection and is a court-appointed expert in data security and incident response.
Eric Sites

Eric Sites

Chief Software Architect

Read Bio
Ophir Rachman

Ophir Rachman

VP of Engineering

Read Bio
Nick Ryan

Nick Ryan

VP Marketing

Read Bio
Tim Durant

Tim Durant

Head of Worldwide Sales

Read Bio
Joan Dorsey

Joan Dorsey

Head of People

Read Bio
Joe Crowley

Joe Crowley

Director Sales Engineering

Read Bio
Paul Lewis

Paul Lewis

CEO & FOUNDER

Paul is a serial cybersecurity entrepreneur with more than 30 years in the industry. Formerly the Founder and CEO of PG Lewis LLC, a cyber security and data forensics company that was strategically acquired by Robert Half International (NYSE:RHI), and the Founder and CEO of MC2, a data security company that was strategically acquired by Volt Information Sciences (NYSE:VOL), Paul's been granted numerous patents to advance data privacy and protection and is a court-appointed expert in data security and incident response.
Eric Sites

Eric Sites

Chief Software Architect

Eric Sites brings over 30 years of experience in technical leadership. Eric served as the Chief Data Scientist at KnowBe4 which he helped grow. He has also served as technical founder and CTO of multiple successful software companies including Meros, Sunbelt, ThreaTrack Security, GFI and others.  Eric leads the engineering teams at Calamu and provides product architectural direction.
Ophir Rachman

Ophir Rachman

VP of Engineering

Ophir Rachman brings a rich background of engineering leadership experience to his role as VP of Engineering at Calamu. He is a product-oriented executive with a proven track record of assembling top-notch development teams to tackle ambitious and high-impact projects for both startups and enterprises. Having formerly served at VMware, Fortscale, and Menlo Security, Ophir’s proven track record includes cutting-edge projects in virtualization, security, big-data, machine learning, AI and cloud. Ophir has a Ph.D. in Computer Science and holds several US patents. 
Nick Ryan

Nick Ryan

VP Marketing

Nick Ryan is a technical marketing leader and go-to-market strategist, with nearly two decades in the software industry and expertise across cloud computing, cybersecurity, and data protection. Prior to joining Calamu as a founding team member, Nick dedicated his expertise to companies including Google Cloud and MainConcept, with a focus on activating hyper-scale growth for new and disruptive technologies.
Tim Durant

Tim Durant

Head of Worldwide Sales

Tim is an accomplished sales leader with over 20 years track record of engaging customers and partners to drive collaboration and revenue growth on a global scale. Throughout his diverse career, spanning the United States Navy, multiple technology startups, Hitachi, and most recently DomainTools he has honed his expertise in leading global teams, building Go-To-Market partnerships and assisting customers across various industries.
Joan Dorsey

Joan Dorsey

Head of People

Joan Dorsey is a proven administration leader and analyst, with more than a decade’s experience in accounting, business administration and people operations. Formerly of T&M, a security and cyber intelligence firm, and MetLife, Joan now dedicates her experience to directing people operations at Calamu.
Joe Crowley

Joe Crowley

Director Sales Engineering

Joe is a seasoned data protection professional with over 20 years of experience at Veritas Software (acquired by Cohesity), where he began his career in NetBackup Customer Support. Throughout his tenure, he has consistently demonstrated deep expertise in data protection, earning a reputation for his technical knowledge and unwavering dedication to customer success. Joe later transitioned to the Sales Engineering field, where his customer-centric approach has led to significant accomplishments, further solidifying his ability to build strong, trust-based relationships.

Our mission is to make the cyber world a safer place for business. Calamu's data-first approach helps organizations thrive without fear that their own data will be weaponized against them.

PAUL LEWIS, FOUNDER / CEO

Board of Directors

lou_ryan

Lou Ryan (Chairman)

Former CEO & Executive Chairman of Edgewave

Lou Ryan is a serial cybersecurity entrepreneur and investor, with successful exits in his more than 30 years experience leading startup companies. Formerly the CEO and Executive Chairman of Edgewave, and previously of Entercept Security Technology, Lou is an Executive Advisor to Calamu and sits on the Board of Directors.

View Linkedin
Stephen Ward Photo

Stephen Ward

Managing Director at Insight Partners

Stephen Ward is a Managing Director at Insight Partners, focused on investments in cybersecurity. Prior to joining Insight, Stephen was Chief Information Security Officer at The Home Depot, where he provided progressive direction over cybersecurity and technology risk. His innovative approach has led to malware related patented technology and he has received award recognition from his industry peers in cybersecurity. 

View Linkedin
john_stewart

John Stewart

Former SVP Chief Security & Trust Officer Cisco Systems, Inc.

John Stewart is an angel investor and startup advisor at Talons Ventures, with more than 30 years experience in cybersecurity. Formerly the SVP Chief Security & Trust Officer of Cisco Systems, Inc, he now serves on the Board of Directors at Calamu in addition to serving at TrustMAPP, Quantum Xchange, Blackpoint Cyber, and more.

View Linkedin

Advisory Board

Jeffrey Weinstein

Former Chief Growth Officer of Traliant

View Linkedin

David Holland

Former SVP & Treasurer of Cisco Systems, Inc

View Linkedin

David Schneider

President Emeritus of ServiceNow

View Linkedin

Joe Merces

Co-Founder of Cloud Daddy

View Linkedin

Marla Crawford

General Counsel of Cimplifi

View Linkedin

Patrick Burke

Former Deputy Superintendent of New York State Department of Financial Services

View Linkedin

Robin Matlock

Former CMO of VMware

View Linkedin

Backed by founders, executives, and security leaders from transformational companies:

HSBC logo
JP Morgan Logo
EY logo
VMWare logo
cisco logo
apple_logo
servicenow logo
Edgewave logo
Volt logo
CarbonBlack-Logo-Primary-Black
Cimplifi-Logo-767x633 copy
eset
data domain logo
knowbe4
google_cloud-ar21
Entercept logo