Coaching, consulting, and workshops for startup founders and product leaders

We believe that there is a science to building high-growth products.

We often hear people say it’s luck or intuition, but we think it’s more than that. We believe the startup founders and product leaders who have a good intuition are applying principles that everyone can learn. So we’re on a mission to spread the knowledge to innovators and entrepreneurs everywhere.

Want to learn how to use product science to launch successful products, develop top teams, and build a sustainable, scaled organization?

of PMs and Founders Helped
Holly looking at camera

Our Clients

Northwestern Mutual
The Lean Startup Company
SPS Commerce
Weight Watchers
First American
Presidio Petroleum
Capital One
Phoenix Team
Falcon X

Who We Work With


You're an executive or product leader looking to innovate faster and compete in today's fast-changing world.

We'll help you hire and train your team with the continuous product discovery and product leadership skills needed to grow.

Learn More

Growth-Stage Startups

You've found product-market fit and now you're building the team to help you scale to the next level.

We'll help you find the gaps in your product organization and avoid the scaling problems we've seen time and again.

Learn More

Early-Stage Startups

You've been building product and getting the word out there, but you are still looking for that elusive product-market fit.

We'll work with you and your team to identify the most impactful changes you can make to your product and your process to get you there faster.

Learn More

The Product Science Principles

Over 15+ years in tech companies, founder Holly Hester-Reilly has developed product science, a theory for building high-growth products, teams, and companies.

People have more choices today than ever before, so product science focuses on creating experiences they want to be a part of. Our world changes fast, so product science relies on continuous feedback and rapid learning loops.

At its core, product science is about finding people’s pains and developing effective solutions for their problems – with the products we build, the processes we use, and the organizations we create.

Evidence-Based Product Strategy

Understand your users, your market, the product, and feasibility. Make informed decisions about which growth opportunities to pursue.

Read More

Continuous Discovery & Delivery

Work in small, cross-functional teams using design thinking, lean startup, and agile software development. Focus on outcomes, not output.

Read More

Empowered Teams

Set the vision. Communicate the values. Then empower autonomous teams with the context and authority to make great decisions quickly.

Read More

Live Online Cohort-Based Courses

Each course is a 2-week dive into a specific product science practice and the principles behind it. Our first course focuses on How to Make Space for High-Impact Product Discovery Experimentation.

Learn more

Meet Our Team

The Product Science Group is made of passionate product leaders with decades of experience across startups and enterprises.

Holly Hester-Reilly

Product Leader & Founder

Holly is the founder of Product Science Group. Holly was a product leader at MediaMath during their journey to becoming a unicorn and at Shutterstock in the years after their IPO. She has spent the last 15 years working with startups, high-growth companies, and enterprises.

Read More

Dina Levitan

Product Manager & User Researcher

Dina is a product management and user research consultant with over a decade of experience in the tech industry. She's been an engineering leader at Google and product leader at venture-backed startups. She has Computer Science degrees from MIT and an MBA from University of Washington

Read More

Mark Enache

Designer of all the digital things who strives towards experiences that bring people together on common ground, both within teams and with users.

Read More

What Our Clients Say

Really great outcome at exec meeting. We have what feels like a clear road ahead for the first time in the history of this project. PSG has succeeded where others have failed. Well done!

Victoria Blake
Chief Product Officer

Thank you for the course. It was very insightful and I took a lot of notes that I am now eager to try!

Tanya Zuger
Head of Product

As a senior product designer who was consulting on a project with the Product Science Group, I joined one of Holly's workshops to better understand her methodology. The workshop developed on the knowledge I was exposed to through seeing Holly work and ended up being an absolute career-changer. Through everything I learned about product discovery, I've been able to bring a unique skillset to the teams I've joined since, resulting in higher pay, more responsibility, more consciousness, and an all-around better professional experience.

Mark Enache
Lead Product Designer

Holly worked with FalconX at a time of high growth for the product team and as the company was doubling in size. Holly helped us take on many scaling challenges, and her focus on collaboration, communication, and product research left a positive mark on the team.

Samir Ghosh
Director of Product
Falcon X

I was ready to move forward with what I thought was going to be a really stellar product hire. Thankfully, Holly advised me in that decision before I extended an offer to that candidate. She confirmed that I actually needed a product manager with significantly more experience than the candidate who I was considering. Had I moved forward with that hire without Holly's counsel, not only would I have wasted a lot of time and money, but I also would have created a really negative experience for that candidate. Holly saved me and that candidate. Holly will save you.

Alyse Dunn

A few months ago I was lucky enough to sit in on Holly Hester-Reilly's Data Driven Product Decisions workshop, and I just HAVE to spread the word about this! Every company wants to be "customer driven" but it's easier said than done. Holly and her team have created a fool-proof system for building great products and working with stakeholders. I left the workshop energized and full of ideas and new perspectives, which has helped my business grow exponentially. This workshop will pay for itself.

Danielle Diamond
Epiq Media

I appreciated the small group dialogue, and the content around influencing stakeholders, which took the course beyond the typical product dev frameworks. Holly’s personal examples affirmed her credibility and added to the course.

Jeff Reiser
Sr Director for Strategy and Business Intelligence
Fitch Solutions

I met Holly when I was seeking a product management job. Holly's insights helped me to land a Technical PM position this year. Big thank you to her for being a true product leader!

Sidharth Sharma
Technical Product Manager

Holly spoke to the students in my Design of Business class at Parsons School of Design - The New School. The students loved her, in fact a few of them used that word. The exercises and stories really helped them to put some things in perspective and to further bridge the gap between design and business. She really helped to situate our learnings in the real world.

Jack Wilkinson
Strategy Director

I really enjoyed the Data-Driven Product Decisions workshop - the topic was one I feel like I am faced with more and more these days. I liked the way Holly did the product opportunity assessment, so I walked my team through some of the exercises to apply to a project we're working on now. It helped us to focus our experimentation.

Joe Lalley
Joe Lalley Experience Design

I especially liked how Holly broke the guidelines of her product opportunity assessment process down into digestible chunks for the break out sessions and built them back up together in the discussion with the other workshop attendees. I also liked the format of a case study with her work at Shutterstock as examples. Felt free but not scary!

Grace Tuttle
Staff Researcher

Data-Driven Product Decisions is the kind of workshop I’d do on my own, even if my company doesn’t sponsor me. The workshop was structured well, dividing us into groups, having us work silently and then collaboratively. We were constantly building on top of the previous work. I found it very useful!  I think it would also be beneficial for strategists and product marketing managers.

Moises Eskinazi
Senior Product Manager
Digital Ocean

Data driven, execution oriented, leader, go getter. Those are the words I would use to describe Holly. Holly came in to Shutterstock when we desperately needed business direction for Skillfeed (a Shutterstock company). She conducted one of the best data driven business analyses I have seen. Holly collected a tremendous amount of data by surveying the competitive landscape, comparing various industry pricing models, categorizing thousands of user feedbacks and came up with concrete suggestions that are backed by data. Furthermore, Holly was able to be Product Owners on multiple successful teams. I would recommend Holly without reservation.

Han Chiu
Click Therapeutics

I worked with Holly on bringing a large enterprise web product to market, and the job could not have been completed without Holly's leadership as the product owner. Holly is the rare product leader who is the complete package: empathetic to users, effective and fun for designers and engineers to work with, and trusted by executives to deliver on strategic KPIs and maintain transparency from concept to launch. I give Holly my most enthusiastic recommendation.

Dillon Zhang Forrest
Founder and CEO

When I was being coached by Holly, I was recently promoted to "SVP of Product: Games" at Arkadium. It was a new position and Arkadium hadn't had a history and process of Product Management. Holly brought specific and actionable experience as well as great tools that I could use to start supporting our growing product team and processes. I was able to instantiate player interview tools and habits that significantly improved the quality of our releases.

Tom Rassweiler
SVP Games and Product

Working with Holly gave me a better frame of reference. Both from conversations with her that are validating to experiences I’ve had and then also references she's provided — books, articles, some tools. Just a generally bigger toolkit.

Ethan Jones
Product Management Director

The impact Holly and H2R had on our company cannot be overstated. I'm trying to use everything Holly taught me - including doing frequent user interviews to get feedback. We did four interviews or so in the last two weeks.

Yves Junqueira
Founder and CEO

Don’t miss The Product Science Podcast

The Product Science Podcast is for startup founders and product leaders building high-growth products, teams, and companies. Listen in on real conversations with the people who have tried it and aren’t afraid to share the lessons they’ve learned (and the mistakes they’ve made) along the way.

Host Holly Hester-Reilly has interviewed over 100 startup founders and product leaders including Marty Cagan, Teresa Torres, John Cutler, Melissa Perri, and David Bland. Tune in now to season 5!

the product science podcast cover art
Listen In!

Let's Talk

I love to hear from executives and product leaders who want to build high-growth products, teams, and companies that can compete in today's fast-changing world.

Let's chat and see if we can work together.

Holly looking at camera