This is a profile image of Grier Tumas Dienstag

Grier Tumas Dienstag


Leads McKinsey’s Insurance and Private Equity & Principal Investors Practices’ joint venture work in North America

Grier works closely with insurance carriers, distributors, and insurance technology providers, as well as investors in the insurance industry. She has a track record of leading successful organic and inorganic growth programs. And, in her work with investors, Grier has extensive experience across the value chain, conducting initial due diligence, partnering with portfolio company-management teams, and supporting exits.

In leading McKinsey’s insurance and private equity joint venture in North America, Grier is responsible for research and knowledge in this area and collaborates closely with colleagues around the globe to serve clients exploring cross-border transactions and growth.

Grier lives with her family in southern Maine. She is a board member of Educate Maine, a not-for-profit organization that champions college and career readiness. She also serves on the New England local advisory board of Jumpstart for Young Children, a national early-education organization.


Insurance investors: Priorities and opportunities,” McKinsey & Company, October 2023

Insurance MGAs: Opportunities and considerations for investors,” McKinsey & Company, August 2022

How insurtechs can accelerate the next wave of growth, ” McKinsey & Company, May 2022

Investing in insurance with Grier Tumas Dienstag and Leda Zaharieva, ” McKinsey & Company, March 2022

Five themes from InsureTech Connect 2021, ” McKinsey & Company, October 2021

A better investor story for insurers, ” McKinsey & Company, September 2021

The insurance trends private-equity investors should understand in 2021, ” McKinsey & Company, August 2021

Insurance resilience in a rapidly changing coronavirus world, ” McKinsey & Company, April 2020

It’s time to cut through the noise on productivity, ” McKinsey & Company, September 2019

Unleashing the CMO in B2B insurance, ” McKinsey & Company, March 2019


Harvard University
BA, romance languages and literatures; economics