Leadership Team

The Caliburn Capital management team boasts a uniquely diverse range of backgrounds, curated to encompass extensive experience in investment management and banking, strategy consulting, operations, P&L management, and growth. With approximately 20 c-suite positions and 30 board seats held both in the US and internationally, our team brings a wealth of leadership and governance acumen. Moreover, our collective track record spans decades of conducting transactions, with an impressive deal value surpassing $70 billion.

Chief Executive Officer

Kariena Greiten

More than 2 decades healthcare experience including CEO and Chief Product Officer roles

Extensive experience leading companies through double digit revenue and EBITDA growth, M&A and financial transactions

Former investment banker with Bank of America and CFO of Tymetrix, an early stage technology company (successful exit)

MBA, The Wharton School, University of Pennsylvania

Vice Chairman of the Board and Founder

Robert Miller

Former VP, General Counsel, Procter and Gamble

Partner with Jones Day

Wealth of experience in corporate law, mergers and acquisitions, intellectual property strategy, technology licensing, contract law, litigation and claims defense, and international trade.

JD, University of Virginia

Founder and Board Member

Walt Adams

Founder of EVI Holdings

Seasoned and highly successful business development, systems development and service delivery professional

Pioneer in Artificial Intelligence

Extensive background growing technology and services startups through executive roles and board service

BS, University of Florida

Founder and Board Member

Brian Wieber

Operating Partner with Cadiz Capital private equity firm

Non-Executive Outside Board Director and Qualified Financial Expert in the fintech, healthcare, and investment industries

35 years of commercial experience leading financial, operational and information technology risk management

Leadership roles with KKR, Lazard, Morgan Stanley, Grant Thornton, and Deloitte

BS, NYU; MBA, Fordham University

Corporate Secretary

Paul Marcela

President of Governance Partners Group

Former General Counsel and Corporate Secretary of Cerebus Capital Portfolio private equity portfolio companies

MBA, Central Michigan University, JD Case Western Reserve

Chairman of the Board and Founder

Kevin Massengill

Executive Chairman and Co-Founder of Meraglim Holdings Corporation

Former Board Chairman of Leidos (NYSE: LDOS) operating companies in Australia, Saudi Arabia, and the United Kingdom

Managing Director for Silver Leaf Partners, a boutique investment bank

Extensive experience in strategy, business development and financial advisory services

MA, Princeton University

2019 Headshot_Preston_Kavanagh (1)[7648].jpg

Chief Financial Advisor

Preston Kavanagh, CPA

10 years experience as Partner and CFO, Conning Capital Partners, a PE fund focused on healthcare and financial services.

Founder of a successful PE-backed insurance company.

15 years experience leading turnarounds

Partner, ILS Funds.

MBA, NYU

Founder and Board Member

Allen Sparks

Co-Founder and CEO of Vernal Partners

Investment management executive with focus on US medical diagnostic companies

Retired professional Maritime Officer with extensive experience building and leading successful teams

Board Advisor

Anthony Russell, MD

Chief Administrative Officer of Ambulatory Medicine, Community Memorial Health System and Executive Director of UCSF Benioff Children’s Physicians (a UCSF Health Affiliate)

Double boarded in pediatrics and clinical informatics

Almost 20 years of administrative and leadership experience in complex healthcare environments

Experienced entrepreneur, including M&A and growth

MD, Medical University of South Carolina; MPH, Johns Hopkins University; MBA, University of Massachusetts

Leadership Team

CONTACT