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- June 2025
- Teaching Note
Arla Foods: Data-Driven Decarbonization
By: Michael Parzen, Michael W. Toffel and Susan Pinckney
Teaching note for Arla Arla Foods: Data-Driven Decarbonization (A), HBS No. 624-003 View Details
- 2025
- Working Paper
How Firms Respond to Worker Activism: Evidence from Global Supply Chains
By: Yanhua Bird, Jodi L. Short and Michael W. Toffel
Social movement pressures can lead organizations to concede and improve social performance to avoid disruption costs, but we theorize that such responses evoke concession costs that prompt organizations to shift resources and attention from other social domains whose... View Details
- May 2025
- Teaching Note
Calyx Global: Rating Carbon Credits
By: Michael W. Toffel and Adam Chen
Teaching note to support the Calyx Global: Ratinng Carbon Credits case (HBS No. 625-102) View Details
- May 2025 (Revised June 2025)
- Supplement
Michael Ku and Global Clinical Supply at Pfizer Inc.: Bringing Hope to Patients (D)
By: Linda A. Hill and Lydia Begag
This fourth installment in the Pfizer Global Clinical Supply (GCS) transformation case series highlights how over a decade of cultural and digital evolution positioned GCS to meet unprecedented global challenges. In 2011, Michael Ku became the Vice President of GCS and... View Details
Keywords: Innovation Leadership; Technological Innovation; Leadership Development; Leadership Style; Research and Development; Science-Based Business; Transformation; Health Pandemics; AI and Machine Learning; Analytics and Data Science; Digital Transformation; Leading Change; Product Launch; Supply Chain; Organizational Change and Adaptation; Alignment; Pharmaceutical Industry; Biotechnology Industry; Health Industry; United States; Asia; Europe; Latin America
- May–June 2025
- Article
Branch-and-Price for Prescriptive Contagion Analytics
By: Alexandre Jacquillat, Michael Lingzhi Li, Martin Ramé and Kai Wang
Contagion models are ubiquitous in epidemiology, social sciences, engineering, and management. This paper formulates a prescriptive contagion analytics model where a decision maker allocates shared resources across multiple segments of a population, each governed by... View Details
- April 2025 (Revised June 2025)
- Supplement
Arla Foods: Data-Driven Decarbonization (A) and (B) PowerPoint Supplement
By: Michael Parzen, Michael W. Toffel and Susan Pinckney
Arla implemented a data based price incentive systems to measure, track, and influence climate friendly changes to reduce CO2 emissions across the world’s fourth largest dairy cooperative. View Details
- April 2025
- Background Note
Climate Change Adaptation with Artificial Intelligence and Machine Learning
By: Michael W. Toffel and Nabig Chaudhry
Artificial Intelligence (AI) and machine learning (ML) have emerged as powerful tools to address climate change. This note summarizes a wide range of the uses of AI/ML to drive climate change adaptation and resilience, the measures organizations and governments are... View Details
- April 2025
- Teaching Note
Allbirds: Decarbonizing Fashion (A) and (B)
By: Michael W. Toffel, Ken Pucker and Stacy Straaberg
Teaching Note for HBS Case Nos. 622-024, 625-004, 625-005, and 625-702. The Allbirds: Decarbonizing Fashion (A) case introduces Allbirds as a footwear startup not only focused on simple design, comfort, and sustainable natural materials but on decarbonizing the wider... View Details
Keywords: Decarbonization; Climate Impact; Environmental Strategy; Innovation; Product Design; Supply Chain Management; Innovation Strategy; Innovation and Management; Product Development; Climate Change; Environmental Management; Environmental Sustainability; Business Startups; Initial Public Offering; Knowledge Sharing; Competitive Advantage; Apparel and Accessories Industry; Fashion Industry; United States; California
- April 2025
- Supplement
Allbirds: Decarbonizing Fashion PowerPoint Supplement
By: Michael W. Toffel, Ken Pucker and Stacy Straaberg
The Allbirds: Decarbonizing Fashion (A) case introduces Allbirds as a footwear startup not only focused on simple design, comfort, and sustainable natural materials but on decarbonizing the wider fashion industry. Background material highlights the growing... View Details
Keywords: Decarbonization; Climate Impact; Environmental Strategy; Innovation; Product Design; Supply Chain Management; Innovation Strategy; Innovation and Management; Product Development; Climate Change; Environmental Management; Environmental Sustainability; Apparel and Accessories Industry; Fashion Industry; United States; California
- April 2025
- Case
#FutureFresenius: Implementing a New Strategy to Transform the Company and Advance Patient Care
By: David J. Collis, Benjamin C. Esty and Haisley Wert
In February 2024, Fresenius CEO Michael Sen reflected on the company’s transformation journey from his office in Bad Homburg, Germany. With revenues of €22 billion and a mission to advance patient care, Fresenius had built a strong reputation through decades of... View Details
- April 8, 2025
- Article
Creating Workplaces Free of Forever Chemicals
By: Joseph G. Allen, Heather A. Henrikson and Michael W. Toffel
Forever chemicals are toxic and widely used in buildings and yet they remain on the rise globally with little regulation to control them. In the United States, for example, Environmental Protection Agency (EPA) regulations currently cover only forever chemicals in... View Details
- March 2025
- Case
Hurtigruten: Sea Zero
By: Christian Kaps and Michael W. Toffel
Hurtigruten was deciding whether the next ship they built should be fully electric. But such a vessel's battery, the size of electric cars, needed to be charged on the ship's multi-day voyage along the Norwegian coast. Before making such a $250 million investment, the... View Details
Keywords: Energy Sources; Alternative Energy; Ship Transportation; Environmental Regulation; Environmental Sustainability; Innovation and Management; Green Technology; Investment; Corporate Social Responsibility and Impact; Shipping Industry; Tourism Industry; Transportation Industry; Travel Industry; Battery Industry; Norway; Europe
- March 2025
- Case
Calyx Global: Rating Carbon Credits
By: Michael W. Toffel and Adam Chen
This case describes how rating agencies and other organizations are seeking to improve the quality of carbon credits sold in the voluntary carbon market to organizations seeking to use them to supplement their internal decarbonization efforts to meet their net zero... View Details
- March 2025
- Case
The Changing Climate on Wall Street
By: Clayton S. Rose, Maxim Pike Harrell and Michael Norris
Increasing and conflicting regulatory requirements and political pressures regarding climate change tested the leaders of U.S. financial institutions, as they struggled to determine how best to comply while managing their business and its risks.
In October 2024,... View Details
In October 2024,... View Details
Keywords: Competency and Skills; Decision Making; Cost vs Benefits; Ethics; Corporate Accountability; Leadership; Management; Risk Management; Corporate Social Responsibility and Impact; Mission and Purpose; Organizational Change and Adaptation; Organizational Culture; Civil Society or Community; Social Issues; Adaptation; Risk and Uncertainty; Insurance; Climate Change; Change Management; Banking Industry; Financial Services Industry; Insurance Industry; United States; Europe
- March 2025
- Article
Boomerasking: Answering Your Own Questions
By: Alison Wood Brooks and Michael Yeomans
Humans spend much of their lives in conversation, where they tend to hold many simultaneous motives. We examine two fundamental desires: to be responsive to a partner and to disclose about oneself. We introduce one pervasive way people attempt to reconcile these... View Details
- February 2025
- Tutorial
Preparing Business Leaders for an Era of Climate Instability: Understanding and Managing Physical Climate Risk
By: Michael W. Toffel and Spencer Glendon
In this compelling video, Spencer Glendon, founder of Probable Futures and Executive Fellow at Harvard Business School, describes the profound implications of climate change for businesses, the economy, and societies around the world. Drawing from his background in... View Details
- 2025
- Article
Educating Students and Professionals on the Business Implications of Climate Change
As climate change poses unprecedented challenges and opportunities, the private sector must play a pivotal role in both adaptation and mitigation efforts. This article discusses the new Harvard Business School Online course, Business and Climate Change, designed to... View Details
- February 2025
- Case
Abiomed: A Change of Heart
By: Satish Tadikonda, Faith Robertson and William Marks
After acquiring Impella CardioSystems AG in May 2005, Abiomed Inc., a company focused on cardiac care, ran into a dilemma. Its Impella 2.5 device was approved for use in the European Union, but CEO Michael Minogue had seemingly bet the company's future on the ability... View Details
- January 2025
- Teaching Note
Vytal: Packaging-as-a-Service
By: George Serafeim, Michael W. Toffel and Stacy Straaberg
Teaching Note for HBS Case No. 124-007. The Germany-based startup Vytal operated the largest digital-native reusable packaging-as-a-service network globally, having raised nearly €15 million, established a large network of restaurant partners, and prevented the use of... View Details
Keywords: Environmental Sustainability; Innovation and Invention; Business Growth and Maturation; Growth and Development Strategy; Business Startups; Resource Allocation; Risk Management; Adoption; Strategy; Performance Productivity; Service Delivery; Service Operations; Supply Chain; Distribution; Entrepreneurship; Climate Change; Business Model; Governing Rules, Regulations, and Reforms; Profit; Financing and Loans; Expansion; Green Technology Industry; Service Industry; Retail Industry; Germany; Europe
- January 2025
- Article
Communication Within Firms: Evidence from CEO Turnovers
By: Stephen Michael Impink, Andrea Prat and Raffaella Sadun
This paper uses novel, firm-level communication measures derived from communications metadata several months before and after a CEO transition for 102 firms to study whether and how this organizational event is reflected in employees’ communication flows. We find that... View Details