Jennifer Aaker

Introduction

Jennifer Aaker (born 15 January 1967) is an American psychologist and the General Atlantic Professor of Marketing at the Stanford Graduate School of Business. She works at the boundary between social psychology and consumer behaviour, and she is known for two quite different bodies of work.

The first established how people attribute personality to brands. Her 1997 paper on brand personality produced a five-dimension framework — sincerity, excitement, competence, sophistication, and ruggedness — that became the standard instrument in a field that had previously borrowed measures from human personality research without checking whether they applied to anything other than people. The second, begun around 2002, turned to how people spend their two most contested resources, time and money, and to how the meaning they attach to happiness shifts over a life and even over a week.

Alongside her academic work she has written for a general audience about the transmission of ideas through social networks and the persuasive power of narrative. Her 2010 book The Dragonfly Effect was accompanied by a campaign that registered more than 115,000 potential bone-marrow donors.

Early Life and Education

Aaker was born in Palo Alto, California, into a family in which branding was already the family trade: her father, David A. Aaker, is a longtime Berkeley professor and one of the best-known figures in brand consultancy.

She read psychology at the University of California, Berkeley, graduating in 1989, and studied there with two of the most exacting figures in the field — the social psychologist Philip E. Tetlock, known for his work on accountability and judgment, and Daniel Kahneman. The combination of experimental rigour and suspicion of easy answers shows up throughout her later work.

In 1990 she moved to the Stanford Graduate School of Business, where she took a PhD in marketing with a minor in psychology, finishing in 1995. Her dissertation on brand personality yielded papers in the Journal of Marketing Research and the Journal of Consumer Research and won several dissertation awards.

Academic and Professional Career

Aaker began as an assistant professor at the UCLA Anderson School of Management in 1995 and returned to Stanford in 1999. She was promoted to associate professor in 2001 and to full professor in 2004, and in 2005 was named General Atlantic Professor and Coulter Family Fellow. She spent 2006–2008 across the bay at the Haas School of Business, UC Berkeley, first as Thomas W. Tusher Professor of Global Business and then as Xerox Distinguished Professor, before returning to Stanford permanently.

She has received the Distinguished Scientific Achievement Award of the Society for Consumer Psychology (2014) and the Stanford Distinguished Teaching Award, and in 2024 the Paul D. Converse Award, given by the American Marketing Association for exceptional contributions to marketing. Since 2019 she has sat on the nomination panel for the Sveriges Riksbank Prize in Economic Sciences. For 2025–2026 she holds the Taubman Family Faculty Fellowship at Stanford GSB.

Her work has been published in both the marketing and psychology literatures — an unusual dual placement — and has been covered in The Economist, The New York Times, The Wall Street Journal, and Science.

Major Contributions to Psychology

The brand personality framework

Before Aaker's work, researchers studying brand personality used existing human personality inventories: the NEO model, Big Five prototypes, adjective checklists. The problem was that these were built from the traits that people use to describe other people, and they missed dimensions that matter for brands while retaining ones that do not.

Her 1997 study took a different route. She had 631 participants rate 37 well-known brands on 114 personality traits and factor-analysed the result. Five dimensions emerged, accounting for the large majority of the variance: sincerity (down-to-earth, honest, wholesome, cheerful), excitement (daring, spirited, imaginative, up-to-date), competence (reliable, intelligent, successful), sophistication (upper class, charming), and ruggedness (outdoorsy, tough). Each dimension decomposed into facets — fifteen in total, built from forty-two traits.

Two of the five, sophistication and ruggedness, have no counterpart in the human Big Five, which was the study's most interesting result: brands are credited with characteristics that the vocabulary of human personality does not contain. The scale gave practitioners something measurable and gave researchers something to test.

Culture and the limits of the framework

Aaker did not leave that question to others. With Verónica Benet-Martínez and Jordi Garolera, she ran the study in Japan and Spain and published the results in 2001. Sincerity, excitement, and sophistication replicated in both. Competence was confirmed in Japan, but in Spain a different dimension appeared — passion. And in both countries ruggedness was replaced by peacefulness. The finding, which she drew herself, was that brand personality is partly universal and partly a product of what a particular society expects brands to be.

Time, money, and happiness

From 2002 Aaker shifted her research programme toward how people actually spend their lives. Working with Melanie Rudd, Cassie Mogilner, and Sep Kamvar, she examined what people mean by happiness and whether that meaning is stable. The earlier literature had divided between researchers who treated happiness as much the same thing for everyone and researchers who treated it as entirely idiosyncratic. Her work found something in between: the meaning people assign to happiness shifts predictably — across the lifespan, and even across a week — and the meaning a person currently holds changes the choices that person makes.

A parallel line asked whether people get more happiness from spending money or from spending time, and from spending on themselves or on others. The general finding, consistent with a larger literature in which she participates, is that how a resource is spent matters more than how much of it there is.

Story, networks, and the Dragonfly Effect

Aaker has argued throughout her career that decisions are moved more by narrative than by information, and that ideas spread through networks in ways that are tractable to study. The Dragonfly Effect — named for the insect's ability to fly in any direction by coordinating four wings independently — set out four elements: a focused goal, an attention-grabbing trigger, an emotionally engaging story, and a way for people to act. With her students, she put it to a test: 100K Cheeks aimed to register 100,000 South Asian donors to the National Bone Marrow Registry, ran the first cheek-swab drives ever held in India, and exceeded its goal. Accounts of the final tally differ slightly — figures between roughly 113,000 and 115,000 new registrants appear in Stanford's own materials — but the campaign is among the few cases in consumer research where an academic intervention can be counted in lives.

Money, meaning, and the limits of "happiness"

Aaker's second research programme has moved steadily away from happiness as an outcome and toward meaning. A recurring target is the assumption, common in both popular advice and policy, that more money buys more happiness and that happiness is the right thing to measure. Working with Rhia Catapano, Cassie Mogilner and Quoidbach, she published a 2022 study in Emotion showing that financial resources change the relationship between meaning and happiness rather than raising either one uniformly: money shifts how much of each a person gets from a given life.

Beauty and the good life

Her most recent line of work concerns beauty — not as aesthetics but as a goal people pursue and, she argues, systematically under-schedule. Creating a Beautiful Life, published in Marketing Letters in 2024, sets out the programme, and a 2025 paper in the Journal of Consumer Research with Erensoy, Lu and Fishbach — "Beauty as a Goal: Creating Harmony Between Health and Taste" — tests one of its central tensions: people treat beauty and health as conflicting aims, and the conflict is resolvable more often than they assume.

Death, regret, and human flourishing

Alongside the academic work Aaker has taken on a second public role that is unusual for a tenured marketing professor. She is a trained death doula, and she has argued that research on deathbed regret — what people say they wish they had done — is the clearest available evidence about what actually matters. That argument now underpins a broader institutional project: in 2017 she co-created Stanford's course on AI for Human Flourishing with Fei-Fei Li, and she is building a Stanford Initiative on Human Flourishing. She advises Google DeepMind's seminar series on human flourishing in a post-AGI world and serves on the boards of the Obama Presidential Foundation and Eat. Learn. Play., the foundation set up by Stephen and Ayesha Curry.

Major Publications

Aaker, J. L. (1997). "Dimensions of brand personality." Journal of Marketing Research, 34(3), 347–356.
Aaker, J., Benet-Martínez, V. & Garolera, J. (2001). "Consumption symbols as carriers of culture: A study of Japanese and Spanish brand personality constructs." Journal of Personality and Social Psychology, 81(3), 492–508.
Mogilner, C. & Aaker, J. (2009). "The time vs. money effect: Shifting product attitudes and decisions through personal connection." Journal of Consumer Research, 36(2), 277–291.
Aaker, J., Rudd, M. & Mogilner, C. (2011). "If money doesn't make you happy, consider time." Journal of Consumer Psychology, 21(2), 126–130.
Aaker, J. & Smith, A. (2010). The Dragonfly Effect: Quick, Effective, and Powerful Ways to Use Social Media to Drive Social Change. San Francisco: Jossey-Bass.
Aaker, J. & Bagdonas, N. (2021). Humor, Seriously: Why Humor Is a Secret Weapon in Business and Life. New York: Penguin Random House.

Impact and Legacy

The brand personality scale is one of the most cited instruments in consumer research and remains the default starting point for anyone studying how brands acquire human characteristics. Its real contribution was methodological: it established that brand personality is a construct with its own structure rather than a projection of human personality, and that the structure has to be discovered rather than borrowed.

The criticisms that have accumulated are largely about the scale's portability and completeness.

It does not travel. This is the most substantial objection, and it is one Aaker herself documented. The 2001 study showed that ruggedness does not survive translation into Japan or Spain, and that Spain generates a dimension — passion — the American scale has no room for. Subsequent work has produced different structures again: a six-dimension model in Australia, a four-dimension model in Germany, and in China a native-language scale built around benevolence, wisdom, courage, happiness, and elegance. The practical consequence is that the scale has to be rebuilt, not merely translated, for every cultural context, which limits its value as a cross-national instrument.

It only measures the positive. Researchers including Bosnjak, Bochmann and Hufschmidt, and Geuens, Weijters and de Wulf, have pointed out that the framework contains only socially desirable traits. A brand perceived as dishonest, incompetent, or cheap has no place in the model, so the instrument cannot represent most of what actually goes wrong with brands. Several later models added negative dimensions specifically to fix this.

It may not be measuring the brand. A persistent ambiguity in the literature is whether participants are describing the brand's character or the character of the person they imagine using it. The scale does not distinguish anthropomorphism from user imagery, and the two produce different predictions. Scores that mix them are difficult to interpret.

The factor structure is sensitive to how it is tested. Austin, Siguaw, and Mattila found that the scale works well across a range of product categories, but other studies have reproduced five factors only with particular item selections, and the number of dimensions recovered depends on decisions the researcher makes before the analysis begins.

The happiness findings are smaller than their prescriptions. The time-versus-money and meaning-of-happiness results come from laboratory and survey samples with modest effect sizes, and they have not been subjected to the large pre-registered replications that would establish them firmly. The advice that has flowed from them — spend on experiences rather than things, spend on others rather than yourself — is considerably stronger than the underlying evidence, and sits inside a well-being literature in which several central claims remain contested.

Finally, the popular work is best read separately from the science. The 100K Cheeks campaign is a real and verifiable achievement. The Dragonfly Effect is a set of maxims drawn from it, not a model that has itself been tested.

Her recent work attracts a different kind of objection. The brand personality scale rests on a single 1997 study of 631 American participants rating 37 brands; whatever its durability, the instrument was built for a commercial world of packaged goods and national advertising, and applying it to platform brands, creator brands and AI products is extrapolation rather than measurement. The newest strands — beauty, deathbed regret, human flourishing — are published largely as short essays, presidential addresses and edited volumes rather than as the multi-study programmes that established her reputation, and her flourishing work now runs through institutions she is formally tied to, including an advisory role at Google DeepMind. None of that makes the claims wrong. It does mean that the confident tone of the recent work currently outruns its evidence base, in much the way the time-and-money advice did.

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References

Aaker, J. L. (1997). Dimensions of brand personality. Journal of Marketing Research, 34(3), 347-356.