“Last month I was just asking ChatGPT to write emails. Now I’ve built a client onboarding tool, and my team probably thinks I hired a developer.”
VP of Operations
Series B SaaS
Proof, not promises
Verified MasteringAI customer case studies, video testimonials, and 5-star Google reviews — real AI implementation case studies and training outcomes from solo founders to enterprise teams.
Trusted by PE-backed companies, GTM teams, and founders
Customer case studies
Strive Skin
For Builders1:1 AI Coaching · 60 Days
paid conversion increase
Read the full case study“I thought I was an AI power user… until Mark made me realize I had no idea what was actually possible.”
- Angel Olavarria, CEO
Real Estate SaaS
For TeamsWorkshop Training · 15 Reps
more meetings booked
“Our newer reps now show up to calls as prepared as our senior guys. That research gap just… disappeared.”
- VP of Sales
Sales Tech SaaS
For TeamsTwo Half-Day Sessions · 18 People
more content produced
“Before this, half the team thought AI was overhyped. Now those same people won’t shut up about it.”
- Head of Revenue Operations
Video testimonials
Three-minute video reviews from real MasteringAI customers — founders, CEOs, and enterprise operators. No script, no agency polish.
Customer testimonials
“Last month I was just asking ChatGPT to write emails. Now I’ve built a client onboarding tool, and my team probably thinks I hired a developer.”
VP of Operations
Series B SaaS
“Research that used to take me half a day now takes 20 minutes. Competitor analysis, market research, customer interviews - all transformed.”
Strategy Consultant
Management Consulting
“I finally understand what my engineering team is talking about. More importantly, I can spec out AI features without needing them in every conversation.”
Product Leader
Fintech
“The prompt engineering framework alone saved me. I was getting mediocre AI outputs for months. Now I get usable first drafts 90% of the time.”
Marketing Director
E-commerce Brand
Verified Google reviews
Verified Google reviews you can read in full and confirm yourself — no cherry-picked pull quotes.
“I found MasteringAI back in early February. I thought I was already an AI power user, but this quickly took me levels higher and was worth every penny. I immediately used what I learned to restructure much of our business and most all of our numbers are greatly improved as a result. I am also able to do 2-3x the work I was previously able to do and without a loss in quality. You don’t know what you don’t know and so MasteringAI is great for skipping that potentially long learning phase and getting a headstart. Go in, give half a damn, and immediately apply what you learn on a project. You will be blown away.”
“Before joining MasteringAI, I was nervous about entering the world of AI, as it was something completely brand new to me. However, hearing repeatedly that AI was becoming part of the future of every industry, I wanted to make sure I was staying ahead of the curve instead of falling behind. Mark’s course made everything approachable, practical, and easy to understand. What I appreciated most was that it gave clear, real-world ways to actually use AI effectively. Mark explains things in a way that makes sense even for complete beginners, meeting you wherever you are in your journey of learning.”
“I knew nothing about AI before taking this course, only that it was intimidating and confusing. After taking this course, WOW! Mark does a fantastic job of explaining how to work with AI, tips and tricks, and how to use it to your advantage. It was truly a one of a kind experience that made me feel more confident in my AI knowledge and skills. I highly recommend to ANYONE looking to learn more about AI! I can confidently say that I feel like a master of AI after this course.”
“Before MasteringAI, I was mostly learning through trial and error, piecing together information from different places. The course gave me a much clearer framework for using AI effectively and showed me workflows I wouldn't have discovered.”
“What I appreciated about this experience was that the course was well broken down into easy to understand chunks, had great videos and most importantly, experiential exercises to facilitate better understanding. Mark is always available to provide support.”
“AI is quickly becoming a skill everyone is going to need, both professionally and personally. This course made it so much easier to understand than trying to piece everything together on my own. The lessons are clear, practical, and helped me start using AI with confidence much faster than I expected.”
“Very practical examples to overcome the learning curve for AI and amazing ROI, would highly recommend Mark and the team.”
“Mark built us an amazing application that our team uses daily. Made our lives so much easier!”
“I run a skincare brand and I've used AI daily for about three years, so I figured I already knew what I was doing. Mark showed me things I never would have thought to try. We've actually implemented a lot of it, and we've seen better conversions and engagement, especially on our SEO work. The biggest win was time. Learning this on my own would have meant hours of digging through websites and videos. Instead I picked it up in an afternoon and started using it right away.”
“Mark was really patient and helped me really understand the essentials, and by the end I even had my own agents live. Crazy given where I started.”
“Mark does a great job making AI and Claude Cowork/Code approachable without dumbing it down. The course is practical, well structured, and focused on actually applying what you learn, not just watching another series of videos and pretending that counts as progress. Mark's also generous with his time and support.”
“Mark built a custom platform for our team to use and it's been a game changer for visibility into our day-to-day and automating more of our project management. He was also very helpful and timely in build and support of the tool!”
“The course was well broken down into easy to understand chunks, had great videos and most importantly, experiential exercises to facilitate better understanding. Mark is always available to provide support. I learned a great deal and have referred this program to many senior leaders I work with as well.”
“It was a multi-modal approach to learning. And the learning is so important for what is happening in the revenue space. Mark took time to provide custom approaches to learning Claude Code. In other words, it wasn't just a video series that you could grab off YouTube.”
“I already had some prior knowledge and thought that I was ready to start coding but I was wrong. When I went through the MasteringAI courses, this gave me the necessary tools to not just ship apps, but build them with quality and making them look way better.”
“Very practical examples to overcome the learning curve for AI and amazing ROI, would highly recommend Mark and the team.”

Who's behind the work
Mark Fershteyn is a non-technical founder who taught himself to ship with AI — then taught Fortune 500 leaders, DTC founders, and SaaS teams to do the same. The results above are his receipts.
Meet MarkBook a call if you have a team. Browse courses if you build solo. 26 stories on this page · 5.0 on Google.