On this episode of Scientific Enneagram, Danielle—engineer, Type 9, and endlessly curious mind—kicks off a foundational series by tracing the (surprisingly recent) history of psychology and asking a practical question: where does the Enneagram fit when we try to study people with scientific rigor?

Starting with early introspection and its “observer problem,” Danielle walks through the major movements that shaped modern psychology: psychoanalysis (and its depth—and unfalsifiability), behaviorism (and its measurable clarity—at the cost of inner life), and cognitivism (the shift that re-centers internal processes, from CBT’s thoughts-feelings-actions triangle to schema theory and maladaptive “software” running on the brain’s “hardware”).

Along the way, she connects these frameworks to the Enneagram’s strengths and limitations—especially why the Enneagram aligns more naturally with modalities that prize inner motive and subconscious drivers, and why that makes it difficult to study quantitatively. Is the Enneagram destined to remain mostly qualitative? Maybe. But Danielle isn’t ready to stop asking better questions—or hunting for better tools.

If you have corrections, follow-up questions, or ideas for future episodes, email hello@scientificenneagram.com or DM @scientificenneagram on Instagram.

We sit down with Danielle Fuller, creator of Scientific Enneagram, to preview her brand-new podcast coming to our channel in January 2026.

Subscribe : on iTunes or on Spotify .

Danielle is an engineer and a systems thinker who sees a huge gap between the world of Enneagram teaching and the world of science and research. Her passion is to become a bridge-builder between those two spaces, helping us ask better questions, see the limits of what we know, and slowly build a real body of work around Enneagram and science.

In this conversation we talk about:

• Why doing good science with the Enneagram is so hard (self-reporting, motives vs. behavior, and the limits of current tools)
• How psychology has moved through introspection, behaviorism, psychoanalysis, and the cognitive revolution—and where the Enneagram might fit in that story
• The tension between qualitative narrative work (like panels and coaching) and quantitative data (stats, brain scans, validated scales)
• The ways cultural bias shows up in psychological research (WEIRD samples, Western assumptions, college-student data) and what that means for a tool that claims to describe 8 billion people
• Why motive may be one of the most important things science could study—and how the Enneagram offers a lens, not the final word

We also get into funding, grad students, file-drawer problems, conspiracy thinking, and why Danielle is doing this as a passion project even though there’s basically no money in it.

If you’re a scientist, grad student, therapist, or researcher who’s Enneagram-informed (or even Enneagram-skeptical) and want to talk, Danielle would love to hear from you: hello@scientificenneagram.com

I’m genuinely thrilled about this show. My hope is that The Scientific Enneagram becomes a hub for serious conversations about motive, method, and what we can actually know when we bring the Enneagram into the lab.

Thanks for supporting us on Patreon. You’re making experiments like this possible.

The Scientific Enneagram is where curiosity, data, and depth meet. In this trailer, host Danielle—an engineer, Enneagram Nine, and lifelong bridge-builder—shares the story behind the show and why she’s obsessed with bringing more nuance and research to the Enneagram space.

Drawing on 15 years in the defense sector, a master’s degree in the psychology of mental health from the University of Edinburgh, and a knack for translating “engineer-speak” into human language, Danielle explains how she stumbled into becoming a conduit between science and the Enneagram. She talks about her frustration with rigid, unreliable personality tests, why the Enneagram’s situational and developmental lens felt like home, and how that led to her running informal studies on Enneagram types, neurodivergence, and mental health with thousands of respondents.

If you’re hungry for evidence, allergic to oversimplified memes, and committed to a “relentless pursuit of nuance,” this podcast is for you.