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Robert Kolker: Amazon KDP author data
Robert Kolker has 10 books on Amazon, 9 of them on a best-seller list in the last 30 days (best rank #1), mostly in Professionals & Academics, Biological Sciences, Medical.
10Books on Amazon
9Listed in 30 days
4.5Average rating
| Median price | $15.49 |
|---|---|
| Price range (middle 50%) | $14.96 – $17.75 |
| Median reviews | 3,547 |
| Total reviews | 78,349 |
| New books (30 days) | 2 |
| Breakout books (30 days) | 2 |
What stands out
- 90% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
Robert Kolker's best-ranked books
-
Hidden Valley Road: Inside the Mind of an American Family
by Robert Kolker
- Price$14.99
- Rating4.5
- Reviews22,378
-
Hidden Valley Road: Inside the Mind of an American Family
by Robert Kolker
- Price$14.95
- Rating4.5
- Reviews22,378
-
Hidden Valley Road: Inside the Mind of an American Family
by Robert Kolker
- Price$11.77
- Rating4.5
- Reviews22,378
-
The Vanishing Family: Love, Fate, and the Quest to End Dementia
by Robert Kolker
- Price$18.09
- Rating4.6
- Reviews198
-
The Vanishing Family: Love, Fate, and the Quest to End Dementia
by Robert Kolker
- Price$15.99
- Rating4.6
- Reviews197
- Published2026-09
-
Lost Girls: An American Mystery—An Examination of the Lives of the Victims of the Gilgo Beach Serial Killer – Explore the Story Behind the Case as the Trial Unfolds
by Robert Kolker
- Price$14.99
- Rating4.1
- Reviews3,547
- Published2024-05
-
Lost Girls: An American Mystery―An Examination of the Lives of the Victims of the Gilgo Beach Serial Killer – Explore the Story Behind the Case as the Trial Unfolds
by Robert Kolker
- Price$13.98
- Rating4.1
- Reviews3,547
-
Los chicos de Hidden Valley Road
by Robert Kolker
- Price$16.73
- Rating5.0
- Reviews1
-
Lost Girls: An American Mystery
by Robert Kolker
- Price$22.79
- Rating4.1
- Reviews3,547
-
The Vanishing Family: Love, Fate, and the Quest to End Dementia
by Robert Kolker
- Price$25.99
- Rating4.6
- Reviews185
- Published2026-09
Main categories
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.