Timothy P Derouin, CFP®, CLU®, ChFC®, CASL®, RICP®

Wealth Management Advisor

My Team

When you became my client, you placed your trust in me to help make your vision a reality. I honor that trust with the help of my expert support staff. Together, we make a strong commitment to customer service.

If at any time you have a question, concern or need, please let us know.


Julianne R Derouin

Julianne R Derouin, CLU®, CASL®, ChFC®

Director of Investment Operations
Office 515-697-4671

With our three girls now attending school, my wife Julie joined my practice.  With a master's degree in Library and Information Science, her attention to detail, thoroughness, and organization skills benefit  not only my clients, but compliments my style of business. As a  Registered Representative with Northwestern Mutual Investment Services, LLC Julie holds the Series 6 and 63 securities licenses. She is also licensed in the state of Iowa for life and health insurance and long term care. She  obtained her CASL® designation. The Chartered Advisor for Senior Living (CASL®) designation is conferred by The American College of Financial Services.

How Julie can assist you:

  • Review of your investment accounts
  • Educate on investment concepts
  • Faciliate opening investment accounts
  • Service on any investment accounts
  • Discuss RMDs (Required Minimum Distributions) from your retirement or inherited accounts
  • Run investment proposals or variable expenses analysises on annuities
  • Analyze your investment statements and how your investments fit into your overall financial plan
  • Work with your accountant on tax strategies with your investment accounts
Diana L Sonnenburg

Diana L Sonnenburg

Director of Insurance Operations and Services
Office 515-697-4663

Diana joined the Derouin team at Northwestern Mutual in January 2015.  She graduated with a Bachelor’s degree in Business Administration from Drake University. Diana spent over fifteen years in the food brokerage industry before coming to Northwestern Mutual.  She has extensive customer and sales support, reporting and marketing knowledge. Diana and her husband Matt keep busy with their two children, Saylor and Kole, and all their activities.  And the family loves to spend time boating and relaxing on the lake in their free time. She is also licensed in the state of Iowa for life and health insurance. She holds her long term care license.

How Diana can assist you:

  • Change of address or bank information
  • Provide a consolidated report of all your products with Northwestern Mutual
  • Assist with name changes
  • Review your beneficiaries (and help you update if necessary)
  • Handle the underwriting process of your life, disability, long term care application
  • Send you inforce ledgers of your current insurance products
  • Prepare insurance proposals
Jennifer McLaughlin

Jennifer McLaughlin

Marketing and Scheduling Assistant
Office 515-697-4671

Welcome our newest team member, Jennifer Harper-Mumm.  She graduated with her Associate's degree in Accounting from Des Moines Ankeny Community College in May of 2017. She is continuing her education at Grandview in Des Moines as an accounting major with a minor in finance. When she is not working with us, attending classes, or studying, she is planning her upcoming wedding (December of 2018) to her sweetheart Eric.

How Jennifer can assist you:

  • Schedule your reviews with Tim
  • Change your appointment time
  • Update contact information
  • Forward your service needs to the appropriate team member

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