CelesiumAI
— Leadership · The studio

People who
operate.

The CelesiumAI team is small by design — operators, directors, advisors, and co-founders who have built and run real businesses, not pure technologists who haven't.

Operating leadership
Senior Director

Michael Rome

Business Development · Enterprise Relationships

Senior Director at CelesiumAI. Leads business development and corporate relationship management, anchoring the studio's relationships with large enterprises and Fortune 500 partners. LinkedIn ↗

Senior Director

Phillip Phan

MD · Houston

Physician and Senior Director at CelesiumAI. Drives the studio's healthcare and clinical-AI strategy and helps lead product development across the active portfolio. LinkedIn ↗

Directors
Director

Greggory Keiffer, Ph.D.

Ph.D. · Operations & Business Development

Director at CelesiumAI. Brings senior strategic and technical counsel across the studio's operations and business development. LinkedIn ↗

Advisory Co-Chairs
Co-founders
Co-founder

Ian Phan

Engineering · Original architect, BillXM

Co-founder of CelesiumAI. Original architect of BillXM. Brings the engineering instinct and willingness-to-ship that defines how the studio prototypes new AI tools.

Co-founder

Grayson Phan

Product · Original architect, Vigilarx

Co-founder of CelesiumAI. Original architect of Vigilarx. Focuses on product surface and user experience across the portfolio's institutional AI tools.

Managing Directors
Managing Director

Marty Hill

JD · Legal & Strategic Partnerships

Trial attorney and partner at Pagel, Davis & Hill. Anchors the studio's legal-tech vertical, including the BillXM enterprise relationship serving personal-injury defense practices.

Managing Director

Jonathan Ramirez

Operations · Investments

Managing Director at Celesium Capital. Leads operations and capital structure across CelesiumAI and the broader Celesium platform.

— Studio

The structure.

CelesiumAI LLC is a Texas company headquartered in Houston, incubated under and operated alongside Celesium Capital — a private equity firm with deep roots in healthcare, technology, and real estate.

Form

CelesiumAI LLC

A Texas limited liability company headquartered at 6222 Richmond, Ste 800, Houston, TX 77057. Each portfolio platform is incorporated as a standalone subsidiary or licensed entity.

Parent

Operated under Celesium Capital

CelesiumAI is the technology arm of Celesium Capital — a Houston-based private equity firm focused on healthcare, technology, and real estate. The PE platform provides governance, capital, and institutional relationships.

Where

Houston · Texas Medical Center

We work in proximity to the largest medical complex in the world. Active collaborations with faculty at Baylor College of Medicine, Rice University, MD Anderson, and the Texas Medical Center inform every healthcare and research-security AI tool in the portfolio.

We don't grow the team to grow the team.
We add operators when the work demands them.
— On hiring posture