Gregory Blotnick
Investor and author Gregory J. Blotnick was born in New York City in 1986. He spent his formative years in Cambridge, Massachusetts, where he attended Buckingham Browne & Nichols School and graduated in 2005.
He went on to earn a Bachelor of Science in Finance from Lehigh University in 2009, graduating amidst the global financial crisis, an experience that shaped his perspective on market cycles. He became a CFA Charterholder in 2012. In 2014, he completed his MBA at Columbia Business School. There, Blotnick’s academic focus gravitated toward security analysis, portfolio management, and investor psychology, topics that would become central to his writing. He studied under several influential practitioners and immersed himself in the study of behavioral economics, particularly the cognitive biases that plague even the most seasoned investors.
Blotnick began his professional investment career as an equity analyst at Doubloon Capital, a Connecticut-based hedge fund. His responsibilities included conducting in-depth fundamental research, building financial models, and identifying long and short investment opportunities across the Consumer sector. His analytical skill and sector-specific expertise led him to subsequent roles at Exis Capital and North Elm Capital in New York City, where he further honed his investment philosophy and approach to security selection.
In 2017, Blotnick was recruited by Citadel LLC as a Consumer sector specialist, and became part of an investment team responsible for managing a $1 billion market-neutral portfolio. His responsibilities included deep industry research to develop variant views on securities under coverage, paired with a nuanced understanding of both macroeconomic trends and relative-value factor-neutral pair trades.
Building on a decade of investing experience, Blotnick launched Brattle Street Capital LLC in 2019, an investment firm focused on long/short equity portfolio construction within the small and mid-cap Consumer universe. The firm took a research-intensive approach to identifying mispriced securities, with a particular emphasis on idiosyncratic opportunities too small or illiquid for larger hedge fund mandates. The firm is named after Brattle Street in Cambridge, the same street where Blotnick grew up, in a subtle nod to his roots.
Blotnick's writing career began in 2012 under the pseudonym Brattle Street Capital, a moniker that quickly gained traction in the online investing community. His Twitter handle, @brattlestcap, became a go-to source for sharp commentary and was recognized as a “must-follow” by both Business Insider and Forbes for its blend of market insight, wit, metacognition and investor psychology. Over the past decade, Blotnick's byline has appeared in a wide range of respected financial and business publications, including Forbes, Fortune, Kiplinger, NewsMax, MarketWatch, CFA Institute, Seeking Alpha, and others. His writing often explores the intersection of investing and psychology, with a strong emphasis on behavioral finance: the study of how human emotion and cognitive biases interfere with rational decision-making. Blotnick’s writing goes beyond surface-level commentary, delving into topics like overconfidence bias, anchoring and confirmation errors, herd behavior, and loss aversion, not only as they apply to markets but as broader metaphors for life and business leadership.
Blotnick’s debut memoir, Blind Spots: A Riches to Rags Story, is a candid and deeply personal account of ambition, failure, and the blind spots that even highly-educated professionals can overlook. The memoir chronicles his personal and professional journey, offering a brutally honest reflection on hubris, denial, and the cognitive traps that can lead smart people astray. It has been praised for its vulnerability, depth, and insight by outlets including Kirkus Reviews, The US Review of Books, and Manhattan Book Review. He is also the author of "Essays: De Rerum Natura," a collection of thirty philosophical essays.
Today, Blotnick continues to write and speak publicly on topics at the intersection of investing, psychology, ethics, and personal development. He emphasizes the importance of self-awareness, humility, and emotional intelligence in navigating both markets and life. Through his ongoing work, Blotnick challenges audiences to examine their own blind spots and internal narratives, arguing that unchecked ego, not lack of knowledge, is often the true root of professional downfall. In addition to his writing, he remains active in the investment community and contributes regularly on behavioral finance and equity investing. You can find him on Facebook or Instagram.