I’m Peter Kang. I run a holding company that acquires and grows agency businesses. I write about business, life, personal finance, and the ups and downs of the journey. Check out my bio and my personal mission statement.

I’m also the author of The Holdco Guide, a book for entrepreneurs who want to move from running one business to owning a portfolio of cash-flowing operating companies.

Blog Highlights

Below are some highlights from my blog.

Running an agency business:

• Agency Journey, my monthly series on running Barrel Holdings
• Agency Business Lessons: Distilled and Oversimplified
• Agency Lead Sources and Going Deeper with Each
• Small Agency Owner Compensation
• Calculating Project Profits at a Creative Services Agency
• Exploring Client Concentration in an Agency Business
• The No Exit Approach to Agency Business
• Agency Survival: Handling Challenging Times for the Business

Habits & Life Reflections:

• An Annual Review: 2025, 2024, 2023, 2022, 2021
• Habits That Stuck: 2020, 2019, 2018, 2017, 2016, 2015
• Operating Rules Vol. 1, Vol. 2
• Lessons from Atomic Habits by James Clear

Personal finance & investing:

• My Personal Finance Snapshot: Nov 2025, Nov 2024, Nov 2023, Aug 2022, June 2021
• My Personal Finance Stack: 2020, 2019, 2017, 2015
• Stock Investing: A Look at My Portfolio

Writings on The Fifth Discipline, one of my favorite books:

• Reflecting on The 11 Laws of The Fifth Discipline (from Peter Senge’s The Fifth Discipline)
• The Seven Learning Disabilities from The Fifth Discipline
• Systems Archetypes from The Fifth Discipline and How They Apply to a Digital Agency
• Personal Mastery from The Fifth Discipline

Lessons learned from reading books:

I keep track of books I’ve finished on my Reading List.

• Lessons from Pricing Creativity by Blair Enns
• Lessons from Getting Things Done by David Allen
• Lessons from Stillness is the Key by Ryan Holiday
• Lessons from Orphan X and His Ten Commandments
• Lessons from The E-Myth Chief Financial Officer
• The Importance of Marketing to Existing Clients from Managing the Professional Service Firm
• Thoughts on “Exactly What to Say: The Magic Words for Influence and Impact” by Phil M. Jones
• Lessons from The Effective Executive by Peter Drucker: Know Thy Time

Elsewhere

• AgencyHabits: A resource for agency leaders