---
id: "entity-the-first-90-days"
type: "entity"
source_timestamps: ["¶22"]
tags: ["book", "leadership-transitions"]
related: ["entity-michael-d-watkins"]
entityType: "other"
canonicalName: "The First 90 Days"
aliases: ["First 90 Days"]
publicationNote: "Book (publication) — mapped to entityType 'other' since the canonical set has no 'publication' value."
sources: ["reskilling"]
sourceVaultSlug: "hbr-seg-reskilling"
originDay: 10
articleStem: "hbr-nm-100-3-forces-manager-to-leader"
sourceUrl: "https://hbr.org/2026/06/3-forces-are-redefining-the-transition-from-manager-to-leader"
sourceTitle: "3 Forces Are Redefining the Transition from Manager to Leader"
---
# The First 90 Days

**The First 90 Days** is a well-known book on leadership transitions authored by [[entity-michael-d-watkins|Michael D. Watkins]], published by Harvard Business Press (2013 edition). It provides a framework for new leaders to accelerate their ramp-up in the first three months and is widely referenced in executive onboarding and leadership programs. Canonical URL: Harvard Business Review Press / major book retailers' product page for 'The First 90 Days.'

*Note on typing:* the source labels this a 'publication'; because the canonical `entityType` set does not include 'publication,' it is recorded as `other` (a book).