SuccessGuru rates money, business, love, and life advice as editorial opinions. Each score checks the method against published research and the public record, and critical lines cite a source.

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• Cal Newport: 90 out of 100, EVIDENCE-BACKED. Newport is a full professor of computer science at Georgetown with an MIT PhD, and his core claims about attention line up with the interruption and multitasking research.
• Adam Grant: 88 out of 100, EVIDENCE-BACKED. Grant is what this genre rarely offers: an active researcher whose headline claims trace to peer-reviewed work, some of it his own.
• Marisa G. Franco: 88 out of 100, EVIDENCE-BACKED. Franco is what this category should look like: a trained psychologist whose advice tracks the research closely and costs little.
• James Clear: 84 out of 100, EVIDENCE-BACKED. Clear built a bestseller by translating habit science faithfully, and his central claims hold up against the literature.
• John & Julie Gottman: 77 out of 100, EVIDENCE-BACKED. The Gottmans rest on real, peer-reviewed science, and their Four Horsemen framework holds up well.
• Ramit Sethi: 76 out of 100, EVIDENCE-BACKED. His personal finance advice is among the most evidence-aligned in the genre, and we found no regulatory or court record against him.
• Dale Carnegie: 76 out of 100, EVIDENCE-BACKED. Carnegie's core advice, be curious, listen, and make people feel valued, is backed by modern research on liking and conversation.
• Andrew Huberman: 74 out of 100, MIXED. Huberman is a credentialed scientist giving away a lot of solid material for free.
• Alex Hormozi: 73 out of 100, MIXED. Hormozi earns high value marks because the core teaching is free or cheap and practical.
• Esther Perel: 73 out of 100, MIXED. Perel is a gifted clinician whose ideas often point in the right direction, and much of her best work is free.
• Brené Brown: 72 out of 100, MIXED. Brown does real research and is open about its limits, and her ideas sit close to strong findings on psychological safety.
• Dave Ramsey: 68 out of 100, MIXED. The core debt plan is simple and has genuine behavioral research behind it, and most of the content is free.
• Tim Ferriss: 68 out of 100, MIXED. Ferriss gives away a lot of value and his work-efficiency tactics are sound.
• Mel Robbins: 61 out of 100, MIXED. Robbins gives cheap, low-risk nudges and a genuinely good free podcast, and her countdown lines up loosely with real planning research.
• Grant Cardone: 37 out of 100, OVERSTATED. The kernel of 10X, set big goals and work hard, has some support, but it is sold as a guarantee.
• Robert Kiyosaki: 36 out of 100, OVERSTATED. The asset-versus-liability idea is useful, but the rest leans on unfalsifiable stories, heavy leverage and market calls that keep missing.
• Tony Robbins: 36 out of 100, OVERSTATED. Robbins deserves credit for putting his event through a published trial, and parts of his method echo real research.
• Rhonda Byrne: 36 out of 100, OVERSTATED. The Secret's central promise runs straight into the research: fantasizing about outcomes tends to reduce effort, and rehearsing the process beats picturing the prize.
• Tai Lopez: 35 out of 100, OVERSTATED. The advice itself (read, find mentors) is generic and mostly harmless, but the sales machine sells a lifestyle his own disclaimer calls non-typical.
• Napoleon Hill: 35 out of 100, OVERSTATED. Hill gets real credit for specific goals and written plans, which research supports.
• Gwyneth Paltrow (Goop): 35 out of 100, OVERSTATED. Goop settled with prosecutors over health claims and dropped a NASA claim that NASA denied.
• Jordan Belfort: 24 out of 100, HALL OF SHAME. Belfort pleaded guilty to securities fraud and money laundering committed through the business that produced his sales method, which puts him in the Hall of Shame by our rules.
• James Arthur Ray: 8 out of 100, HALL OF SHAME. Ray's flagship retreat ended with three deaths and three negligent homicide convictions tied directly to his business.
• Kevin Trudeau: 5 out of 100, HALL OF SHAME. A federal jury convicted him of criminal contempt for violating an FTC order by misrepresenting his own book, and he was sentenced to 10 years.
• Keith Raniere: 3 out of 100, HALL OF SHAME. Raniere's business was the vehicle for crimes a federal jury found proven beyond a reasonable doubt, and the conviction survived appeal.