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- 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 Allen, Heather Henriksen 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 vessels'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
- 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
Keywords: Change; Disruption; Competency and Skills; Decision Making; Cost vs Benefits; Ethics; Governance; Corporate Accountability; Leadership; Management; Risk Management; Organizations; Corporate Social Responsibility and Impact; Mission and Purpose; Organizational Change and Adaptation; Organizational Culture; Society; Civil Society or Community; Social Issues; Strategy; Adaptation; 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
- 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
- 2025
- Article
Statistical Inference for Heterogeneous Treatment Effects Discovered by Generic Machine Learning in Randomized Experiments
By: Kosuke Imai and Michael Lingzhi Li
Researchers are increasingly turning to machine learning (ML) algorithms to investigate causal heterogeneity in randomized experiments. Despite their promise, ML algorithms may fail to accurately ascertain heterogeneous treatment effects under practical settings with... View Details
- November–December 2024
- Article
Why Employees Quit
By: Ethan Bernstein, Michael B. Horn and Bob Moesta
The so-called war for talent is still raging. But in that fight, employers continue to rely on the same hiring and retention strategies they’ve been using for decades. Why? Because they’ve been so focused on challenges such as poaching by industry rivals, competing in... View Details
- November 2024
- Case
Dr. Bombay Ice Cream
By: William R. Kerr, Alexis Brownell and Michael Liu
This case examines the creation, launch, and rapid growth of Dr. Bombay Ice Cream, a joint venture between Happi Co., a consumer packaged goods incubator, and entertainment mogul Snoop Dogg, with his son, Cordell Broadus. The brand was inspired by a Bored Ape Yacht... View Details
- November 2024
- Article
Perceptions About Monetary Policy
By: Michael D. Bauer, Carolin Pflueger and Adi Sunderam
We estimate perceptions about the Federal Reserve’s monetary policy rule from panel data on professional forecasts of interest rates and macroeconomic conditions. The perceived dependence of the federal funds rate on economic conditions varies substantially over time,... View Details
- September 20, 2024
- Article
It’s Time to Unbundle ESG
By: Aaron K. Chatterji and Michael W. Toffel
ESG is at an inflection point. It has come to represent a broad and inchoate aspiration for what business should be doing beyond maximizing shareholder value. With ESG advocates on the defensive, business leaders need a new roadmap to determine which factors to... View Details
Keywords: ESG; ESG (Environmental, Social, Governance) Performance; ESG Ratings; ESG Reporting; ESG Disclosure; Sustainability; Climate; Climate Finance; Climate Risk; Social Accounting; Investment; Governance; Safety; Climate Change; Environmental Sustainability; Corporate Social Responsibility and Impact; Financial Services Industry
- 2024
- Working Paper
Empirical Guidance: Data Processing and Analysis with Applications in Stata, R, and Python
By: Melissa Ouellet and Michael W. Toffel
This paper describes a range of best practices to compile and analyze datasets, and includes some examples in Stata, R, and Python. It is meant to serve as a reference for those getting started in econometrics, and especially those seeking to conduct data analyses in... View Details
- September–October 2024
- Article
Where Data-Driven Decision-Making Can Go Wrong
By: Michael Luca and Amy C. Edmondson
When considering internal data or the results of a study, often business leaders either take the evidence presented as gospel or dismiss it altogether. Both approaches are misguided. What leaders need to do instead is conduct rigorous discussions that assess any... View Details
- 2024
- Article
Neyman Meets Causal Machine Learning: Experimental Evaluation of Individualized Treatment Rules
By: Michael Lingzhi Li and Kosuke Imai
A century ago, Neyman showed how to evaluate the efficacy of treatment using a randomized experiment under a minimal set of assumptions. This classical repeated sampling framework serves as a basis of routine experimental analyses conducted by today’s scientists across... View Details
- July 2024
- Case
Negotiating in a Hurricane: John Branca and the Michael Jackson Estate
By: James K. Sebenius and Alex Green
When the "King of Pop," Michael Jackson, unexpectedly died in 2009, he left behind an estate that was over $500 million in debt, with largely illiquid assets, and legions of creditors poised to begin to seize assets in as soon as 60 days. The task of managing Jackson’s... View Details
- July 2024 (Revised December 2024)
- Background Note
District Heating: An Overview
By: Willy Shih and Michael W. Toffel
This note provides an overview of district heating: systems in which central plants generate heat that is conveyed by steam or water through a set of insulated pipes to send heat to residential and/or commercial buildings. It describes key elements of the system (heat... View Details