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Our Professionals

The Candeo professional team is one of the most dynamic and innovative in the world—leading clinical psychologists, therapists, neuroscientists and trainers all working together to help you overcome depression and anxiety. While the team has many members, here are four of our team leaders—

Dr. Margaret Wehrenberg

Dr. Margaret Wehrenberg is the lead Clinical Psychologist for Candeo’s Depression and Anxiety service. Dr. Wehrenberg has over 40 years of experience… Read More ››

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Dr. Margaret Wehrenberg


Dr. Margaret Wehrenberg is the lead Clinical Psychologist for Candeo’s Depression and Anxiety service. Dr. Wehrenberg has over 40 years of experience as a mental health professional. She is a world leader in the field of depression and anxiety treatment. She has extensive training and expertise in the neurobiology of psychological disorders, and is the founder of the Reflex Delay Syndrome (RDS) Research and Training Institute. In addition to working with her own clients, Dr. Wehrenberg is a renowned author and speaker, engaged in the training of psychologists and therapists across the world.

As a child, teen and into early adulthood, Margaret suffered with severe bouts of depression and anxiety. It was her search to find tools and solutions for her own life that lead her to pursue a career in the mental health field.

In addition to her clinical work, Dr. Wehrenberg has written articles for Psychology Today and The Psychotherapy Networker magazine. She is the author of a variety of books including:



Derrick Hull

Derrick Hull is the Director of Neuroscience at Candeo. He holds a Master’s degree in Cognitive Neuroscience from Harvard University and a Master’s degree in… Read More ››

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Derrick Hull


Derrick Hull is the Director of Neuroscience at Candeo. He holds a Master’s degree in Cognitive Neuroscience from Harvard University and a Master’s degree in Education Technology. Derrick’s passion is developing brain-science-based education and learning systems that bring about positive, lasting behavioral change.

Derrick’s work in psychology and neuroscience has lead to innovative research programs at Harvard Medical School’s Laboratories of Cognitive Neuroscience and the U.S. Air Force Research Laboratory. A dedicated researcher, Derrick has published professional articles on a wide variety of topics including developmental and cognitive neuroscience, learning theory, medical training, and complex systems theory and management.



Holley Jeppson

As Candeo’s Director of Coaching, Holley’s leadership and innovation are crucial to the success and support of struggling individuals across the world… Read More ››

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Holley Jeppson


As Candeo’s Director of Coaching, Holley’s leadership and innovation are crucial to the success and support of struggling individuals across the world. As a counselor, Holley works with her own private clientele with a special emphasis on depression and anxiety. In addition, she works in the areas of behavioral addiction, substance abuse, and marriage and family issues.

Holley is a leader and innovator in the field of long-term recovery support and after-care. Working hand-in-hand with Clinical Psychologists and their clients, Holley teaches psycho-education courses, facilitates recovery groups, and oversees long-term recovery tracking and support. Holley is also the co-author and trainer for a highly effective program that helps couples and families heal damaged relationships.



Mark Kastleman

As Candeo’s Co-Founder and Director of Education and Training, Mark works with leading brain scientists and psychologists in developing online programs… Read More ››

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Mark Kastleman


As Candeo’s Co-Founder and Director of Education and Training, Mark works with leading brain scientists and psychologists in developing online programs used world-wide to help individuals overcome difficult-to-change behaviors. Mark is recognized for his writing in the areas of brain science and behavioral change, following in the footsteps of his mentor, world-renowned neuropsychologist, Dr. Page Bailey.

Mark conducts training for professionals across the U.S. and in various parts of the world. His audiences have included top government officials, psychologists and therapists, medical doctors, educators, law enforcement and the military.

In addition to his professional background, Mark brings a unique perspective and experience to Candeo through his own early-life struggles with addiction, depression and anxiety and overcoming them.



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