Books
Three books on the work and the life behind it.
Two bestsellers, one on the leadership ceiling that breaks high-IQ technical teams, one a memoir on presence and life in the micro, and a definitive playbook (in progress) on medical device cybersecurity from premarket submission through postmarket surveillance.
Coming 2026, in progress
Medical Device Cybersecurity. The Book.
Navigating Premarket Submissions and Postmarket Surveillance
A complete, working playbook for the teams responsible for shipping safe, secure medical devices. Eleven chapters span the Total Product Lifecycle: regulatory landscape, risk management, Secure Product Development Frameworks (SPDF), security architecture views, interoperability, STRIDE threat modeling, third-party software and SOUP analysis, cybersecurity testing, and structured risk assessment. Every chapter closes with useful tips, key terms, and a real case study from the field.
What's inside
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Threat modeling, STRIDE & SBOMs
Trust boundary analysis, entry point analysis, and threat scenario development, with a worked STRIDE case study.
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Risk management & TPLC
Building a cybersecurity risk management report that holds up across the Total Product Lifecycle, premarket through postmarket.
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Secure Product Development (SPDF)
FDA-aligned development, security architecture views, and design controls that actually clear submission.
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Third-party software & SOUP
Managing components, Software of Unknown Provenance, and SBOMs with a SOUP case study in medical imaging.
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Global regulatory alignment
FDA, EU MDR, PMDA (Japan), NMPA (China), TGA (Australia), plus NIST, AAMI, and IEC standards mapped to one program.
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Real case studies
Philips Tasy EMR (2018), SaMD 510(k), wearable health monitoring, and remote patient monitoring testing.
Bestseller
The Smartest Person in the Room.
The Root Cause and New Solution for Cybersecurity
Opens with Dick Cheney disabling the wireless on his pacemaker because he feared assassination by hack, and uses that image to argue the root cause of the cybersecurity war is not technology, but the people defending us and the smartest-person-in-the-room ego that keeps them from communicating. Drawn from thirty years in the field and the founding of Alpine Security, the book lays out a seven-step Secure Methodology that turns brilliant individual contributors into leaders who can actually be heard.
What's inside
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01 · Awareness
Notice the habits, stories, and reactions quietly running the room before anything else can change.
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02 · Mindset
Trade ego, posture, and fear of ambiguity for curiosity, ownership, and a growth orientation.
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03 · Acknowledgment
Confirm what was actually heard before replying. The handshake most technical conversations skip.
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04 · Communication
Translate technical depth into language a non-technical executive can act on, without dumbing it down.
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05 · Monotasking
Presence is your ally, distraction is your enemy. Run the conversation in front of you, fully.
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06 · Empathy
Cognitive empathy as the unlock for high-trust technical teams, even for engineers who think it is fluff.
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07 · Kaizen
Compound improvement through honest self-review, retros, and small reps that beat heroic overhauls.
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Growth & contribution
The closing chapter on what happens after the seven steps: leading other smart people through the same arc.
Bestseller · Memoir · 2023
The In-Between.
Life in the Micro
Opens with a chain-reaction car accident on May 9, 2022, where Christian and his partner Vanessa stop to help and everything snaps into focus. From that in-between moment, the book traces a path out of a macro-obsessed life of summits, exits, and chase, into a present-moment way of leading and living. Ten chapters move from rock-bottom to actionable awareness, identity, intention, authenticity, core-value alignment, presence, insight, leadership, and the in-between in action.
What's inside
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Rock-bottom & awareness
The Danish breakdown and the slow turn from macro-chasing to actionable awareness of what is happening right now.
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Resetting identity & intention
Trading a chase-defined self for informed intentions, authenticity, and a way of choosing that holds under pressure.
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Core value alignment
Surfacing the values quietly running the show and re-aligning work, relationships, and ambition around them.
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Presence & insight
The micro-moment practice that turns presence into insight, and insight into better decisions at scale.
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Leadership from the in-between
What it looks like to lead a company, a team, and a partnership from the present moment rather than the next milestone.
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The in-between in action
Field stories from the car crash, climbs, business exits, and partnership where the micro-practice actually got used.
Reader reviews · The Smartest Person in the Room
What readers are saying about TSPITR.
‘Open communication allows us to solve problems and commit to fixing them’
"Christian Espinosa passionately leads the reader on a journey of closing the gap and demonstrating beautifully how to seamlessly weave together Intelligence and communication through his brilliant Seven Step Secure Methodology. A must read."
Informational, but most relevant for cybersecurity employers/employees
"I rate this book 4 out of 5 stars because it is very well written and delves deep into the reasons for and psychology of behaviors and shortcomings. It provides detailed solutions, but the focus may limit its potential audience."
The most important thing in cybersecurity [and self]
"In his book, Christian dives into the psychology of self. The author demonstrates that some personalities are not fit for the technical position, despite being 'paper tigers.' This book is essential reading for technical professionals."
Author knows what he is talking about.
"Espinosa runs a cybersecurity business, and this book expertly illustrates how to transition from being proficient in technical skills to becoming a team player. The writing is clear and easy to follow."
Good
"Good insights for anyone in cybersecurity or technical fields. The book covers essential strategies for effectively engaging with clients and improving team dynamics."
Reader reviews · The In-Between
What readers are saying about The In-Between.
The impact of ‘micro-moments’ in our lives.
"Christian Espinosa takes readers on a poignant journey that explores the profound impact of micro-moments. The narrative captures the urgency and clarity after a life-altering incident, compelling readers to appreciate the in-between moments often overlooked."
A testament to the power of self-reflection
"Espinosa emphasizes the significance of appreciating small moments rather than just chasing big goals. Through personal trials, he illustrates the transformative potential of focusing on daily life's micro-moments."
A Book About Approaching the World Differently
"This book argues for valuing minor moments instead of focusing solely on upcoming challenges. It offers vital lessons for anyone dissatisfied with life and looking to rethink their priorities."
A thought-provoking journey into self-discovery
"Espinosa effectively communicates the importance of valuing micro-moments. The narrative flows well, though some sections feel repetitive. Overall, it sparks meaningful introspection for readers."
Compelling and reflective story
"The author's vivid storytelling around a car accident leads to a journey of self-reflection. It encourages a shift from macro-focused living to appreciating nuances in daily life, making it a transformative read."
Bulk orders and speaking