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Jeff Williams

Jeff joined Ascellus as Chief Financial Officer in 2025, bringing more than 25 years of experience investing and scaling innovative technology companies. He has spent his career advising companies on improving operations, enhancing go to market capabilities, and scaling development efforts in high growth organizations including many leading Healthcare IT companies.

Prior to Ascellus, Jeff spent 25 years at Spring Lake Equity Partners (formerly Tudor Ventures), where he was a Partner investing in mid-to-late stage venture backed technology companies. During this time, Jeff invested in over 20 companies and served on over 16 boards of directors leading to over 13 successful exits. Beyond his board experience, Jeff has been actively involved in capital raising and mergers and acquisitions with the portfolio companies he has backed. Jeff continues to advise Cognition Corporation, a Spring Lake Equity Partners portfolio company, and acts as an advisor to .406 Ventures on financial strategy and operations.

He holds a BA in History from Yale University and an MBA from the MIT Sloan School of Management and resides in Boston with his family.

Recent Posts

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Behavioral health in workers' compensation: World Mental Health Day 2026
Mental Health Solutions
10-06-2026
World Mental Health Day: Moving Beyond Stigma to Structured Care in Workers’ Compensation

WORLD MENTAL HEALTH DAY Mental health has never been more visible as a public conversation. In workers’ compensation, the question is no longer whether behavioral health matters; the data settled that years ago. The question now is whether the system is equipped to act on what it already knows. October 10 is World Mental Health […]

Dr. Miranda Kofeldt, Vice President of Clinical Operations at Ascellus
InsightMental Health Solutions
09-28-2026
The First 30 Days: Why Time to First Appointment Shapes Psychological Claims

In her latest Leaders Speak column for WorkCompWire, Dr. Miranda Kofeldt, Vice President of Clinical Operations at Ascellus, looks at a timing problem that rarely shows up on a claims dashboard. Clinically, a traumatic stress reaction tends to either resolve or begin to meet criteria for PTSD within about 30 days. Nationally, the typical wait for a first mental health appointment often runs longer than that. And in workers’ compensation, the pool of clinicians who understand how a claim works is smaller still.

2026 workers’ comp behavioral health outcomes and claims data
InsightMental Health Solutions
09-21-2026
Mid-2026 Check-In: What Behavioral Health Outcomes Data Is Telling Us About Workers’ Compensation Claims

OUTCOMES & PROOF · MID-YEAR INTELLIGENCE Halfway through the year, the data points in one direction: behavioral health factors are among the most reliable predictors of claim duration and cost. Here is what we are seeing in the field, and what it means for how claims teams allocate attention in the second half of 2026. […]

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