David Harper
Principal at Brainy Chief LLC
Rancho Palos Verdes, California, United States
Summary
👤
Senior🎓
Top SchoolDavid Harper is a principal-level EdTech entrepreneur, investor, and instructor with 25+ years of experience translating advanced finance, risk, and data science into practical learning and investment outcomes. He founded and led Bionic Turtle for 15+ years—growing it into a three-time Investopedia top FRM exam provider and a YouTube following of ~100k before exiting to CeriFi—while answering over 20,000 expert-level finance questions with a 99.66% favorable rating. A practitioner of active equity investing and portfolio analytics, he combines world-class spreadsheet pedagogy with hands-on R and Python work (tidyverse-focused) and a portfolio of data science experiments on GitHub and his data blog. His research and teaching bridge applied math, ML, instructional design, and the future of work, and he uniquely integrates realistic code and spreadsheet examples into risk education. Based in Rancho Palos Verdes, he now runs Brainy Chief LLC, continuing to write, invest, and build edtech tools that fuse rigorous finance with practical data-driven workflows.
11 years of coding experience
15 years of employment as a software developer
Bachelor of Arts, Economics, Bachelor of Arts, Economics at University of California, Berkeley
Github Skills (7)
r5
ide4
rstudio3
data-science2
machine-learning1
python1
science1
Programming languages (3)
Github contributions (5)
bionicturtle/dh-data
Jan 2022 - Aug 2023
Contributions:65 pushes, 1 branch in 1 year 7 months
bionicturtle/finedtech2
Sep 2023 - Nov 2024
Contributions:47 pushes, 1 branch in 1 year 2 months
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