Office Profile

Northwestern Mutual - Montana

Since 1857, Northwestern Mutual has been helping people protect against financial risk and helping them achieve their financial goals.  The Network Office, currently headed by Greg Castronovo, opened for business in 1891.

The network office territory includes Montana and Northern Wyoming.  We currently have 34 Financial Representatives and 8 interns working in Montana.  We hope to have Managing Directors in our Billings and Missoula offices in the near future, and continue to grow our offices in Kalispell, Helena, Great Falls, Butte, Dillon, Chinook and Havre. We also hope to more than double our Financial Representative population. 

Our Financial Representatives and their teams partner with our Disability, Long-Term Care, Life Insurance, Investment and SEBS specialists to help solve our client’s specific needs, allowing our representatives to stay focused on our Mission of:


Enriching Lives and Building Financial Security.



About Gregory V Castronovo, CLU®, ChFC®
Managing Partner


Greg became a Northwestern Mutual Financial Representative in 1991 because he wanted to help people like you to have a positive impact on their lives.

Greg is passionate about growing Financial Representatives' Careers.  He is committed to maintaining a team of professionals that are here to help get our newest Financial Representatives off to a fast and successful career.  Greg is also dedicated to providing excellent service to our veteran Financial Representatives and their clients through our competent and caring staff.

Greg is married to Christy Castronovo, a proud father of a son and daughter, Jonah and Delaney, and currently resides in Bozeman.

Greg’s education, training, and professional achievements include:

  • Bachelors of Arts; College of St. Scholastica, Duluth, MN
  • Northwestern Mutual Career School
  • Certified Coach and Trainer
  • Northwestern Mutual Agency Growth Award 2003-2005, 2007-2010
  • MDRT Qualifying Member: 2000-2006
  • NQA - 1993, 2000-2007
  • NSAA - 1999-2000
  • GAMA International Management Award Gold 2006-2011
  • CLU® & ChFC® designations
  • Holds securities registrations



This Network Office has been active since 1891.

Greg V Castronovo


Northwestern Mutual financial representatives have the opportunity to determine their own financial futures while making an impact on others.

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#1 in the Financial Services Industry

- Selling Power's "50 Best Companies to Sell for Now." October 2016

Top Ten Internship for 22 Straight Years

- Vault Guide to Internships, 2018 edition

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To learn more about Northwestern Mutual Investment Services, LLC and its financial representatives, visit: FINRA BrokerCheck