I'm a San Francisco-based investor and market analyst with over twenty years of experience in technology. I now apply my analytical thinking and product strategy background to developing trading strategies and financial models. My work has evolved from creating consumer and B2B products to building investment portfolios and trading systems.
Much of what I do draws on questions I first explored studying philosophy at Grand Valley State University: how people reason under uncertainty, what counts as good evidence, and how we make important decisions about money and meaning. In 2026, GVSU named me a Distinguished Alumni-in-Residence in Philosophy.
I trade listed and OTC equity options as a discretionary retail trader, with strategies grounded in time series analysis and statistical modeling. I use market data from Nasdaq to make well-informed decisions about when to enter and exit positions. I've also built a financial dashboard in React and Python that monitors my trades, account balances, volatility, and market liquidity.
I spent two decades in technology, collaborating with product teams and entrepreneurs at companies of all sizes and helping them develop and refine products at every stage. That experience in innovation and user-centered design shapes how I evaluate companies, and it helps me spot promising opportunities others might overlook.
I'm quietly building something for self-directed investors, bringing together my product background and what I've learned managing my own portfolio. More on that soon. I'm also exploring how machine learning can support my trading research, particularly market pattern recognition and predictive analytics.
Travel is one of my great joys. I've been to more than 60 countries, often well beyond the usual routes, and I love immersing myself in new cultures, meeting people from different backgrounds, and exploring local cuisines. In my twenties I spent nearly two years on Taiwanese television, including appearances in MTV music videos, while studying Mandarin and Chinese calligraphy. I document my adventures through photos and share my experiences on X. I'm working on the next draft of a travel memoir about the connections between global economic systems and the local markets I've seen firsthand.
Closer to home, I'm active in San Francisco's botany and gardening communities and co-lead regular walks for fellow plant enthusiasts.
Please email me if you'd like to talk about financial markets, investment strategies, or where technology and finance meet. I'm always happy to meet over coffee to explore a collaboration or trade ideas.
我的英文名字是馬修,但是我的中文名字是孟默修(我大學時候的哲學教授,替我取了這個很特别的名字。)。
為什麼這裡有中文?因為我喜歡用中文,這是我的第二語言。中文是廣泛使用的語言;讓我在世界各地都能以中文溝通。
大學畢業後,我去台灣學習中文。我也學習國語,書法,文言文和中國藝術史。我和其他台灣學生一起與一位著名老師學習中國書法。
我要告訴大家一個秘密: 我❤️台灣。這個小國對我的生活影響很大。我想念自己在台灣有的自由—學習,探索,失敗和發現有關世界的新事物。我可以說是在台灣長大的。
我在台灣有很好的朋友和記憶,比起其他在台灣的大多數外國人,我也有不同的經歷。我曾是電影,廣告,廣播和MTV音樂錄影帶及電視演員。
離開台灣以後,我一直沒有停下腳步,到過六十多個國家,常常走一般旅客不會去的地方。2026年,我的母校 Grand Valley State University 選我為哲學系傑出校友,邀請我回校與學生交流。
如果您想說中文或想了解更多關於我在台灣的經歷,請發送 電子郵件。
再見!
Matthew Mansfield © 2026