Welcome Letter
Hal C. Lewis, Ph.D., DLF Co-Chairperson & David Margulies, M.D., DLF Co-Chairperson | Fall 2022

As Co-Chairs of the Dan Lewis Foundation for Brain Regeneration Research (the DLF), we are pleased to introduce you to the DLF’s first quarterly newsletter—Making Headway: DLF NeuroConnections. This newsletter will bring reviews and updates on research relevant to brain regeneration. Each issue will highlight a prominent neuroscientist contributing to the field of brain regeneration or a research program advancing medicines and methods to accelerate recovery from brain injury, especially for those in the chronic phase of recovery. In this inaugural issue, we will present the story of Dan Lewis, the namesake, and inspiration for our research foundation. You will also find a link that will take you directly to our website, which provides detailed information about the goals and methods of the DLF. In the coming months we will be adding information regarding resources and events that may be helpful for individuals with serious brain injuries and their families.


The overarching goal of the DLF is to pursue biomedical breakthroughs that will one day improve the lives of those affected by serious brain injury. We aspire to make a broad range of biomolecular medicines and other biomedical therapies available to the vast population of people with moderate and severe brain injuries. We will continue to raise funds and direct such funds toward the most promising and empirically supported biomedical therapeutics. In addition, by supporting programmatic research, the foundation aspires to expedite clinical trials - joint efforts between research institutions, biotech companies, and individuals with brain injuries and their families. The DLF is eager to stay in touch with the needs and aspirations of the brain injury community and its allies. Please visit our website. You will find much more detailed information about the DLF’s objectives and activities and ways you can contact us with questions and/or comments.


You have our sincere thanks for your interest in the DLF and your curiosity about the most cutting-edge approaches to brain regeneration and improving recovery rate and function of persons with serious brain injuries.


With best regards and hopeful wishes for the future,

David Margulies, M.D,

Hal C. Lewis Ph.D.


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Two women embrace, comforted. A man watches from a separate chair. Interior, daytime.

What Does “Ambiguous Loss” Mean?

By Hal Lewis • December 5, 2025
My daughter, currently nearing completion of a graduate program in counselling, recently introduced me to the term “ambiguous loss”. This term applies to a loss that is unclear and lacks certainty, leaving family members and close friends feeling stuck because it is so difficult to mourn or find closure. One type of ambiguous loss is when the person is physically present but psychologically absent because their personality, memory, cognition, or emotional connection has been altered. Examples might include a family member with dementia, a progressive disease, a severe emotional disorder, or substantial brain injury. A second type of ambiguous loss is when the person is psychologically present but physically absent. This could include a missing person due to a natural disaster, a long- term incarceration, a kidnapping, or severe estrangement from the family. This type of loss can lead to intense confusion, frozen grief, and a prolonged sense of helplessness.
Marchell smiling, sitting on a couch, holding notebooks

Marchell’s Story

By Dan Lewis Foundation • December 2, 2025
Marchell is an engaging and energetic middle-aged man who was enthusiastic about being interviewed for the DLF newsletter. He is an activist working to promote the rights and well-being of persons in the brain injury community, with a particular emphasis on helping persons with brain injury who are incarcerated or have been released from prison. Marchell is a successful businessman, proud of the company he co-founded--the Association of Young Business Owners (AYBOS), a marketing company in the Denver, Colorado area. He also works for Well Power (Denver’s Mental Health Center system) as a Zero Suicide Certified Peer and Family Specialist.  Marchell is clearly a man on the move to get a lot of positive things done. But this wasn’t always the case. Marchell spent much of his younger adult life incarcerated himself for a variety of crimes including robbery and assault. He had a history of recidivism following multiple releases.