David C Walther, CFP®, CLU®
Wealth Management Advisor

Physicians Nationwide Financial and Insurance Services

Our Team


Through developing intimate relationships, we customize your financial plan and can help you achieve clarity, peace of mind, and create maximum impact.



Andrew Newsom

Andrew Newsom

Director of Client Relations
Office 415-733-6760

Andrew joined Northwestern Mutual in 2012 and the Walther team in 2018. He works closely with clients as an Associate Wealth Management Advisor through a holistic approach to planning.

Andrew was born and raised in Petaluma, went to Simpson University in Redding, and has been in the financial services industry for approximately 10 years. He holds Series 7, Series 66, and California Life & Health Licenses.

In his spare time, Andrew loves spending time with his wife Manpreet, is involved in his church, and follows the NBA.

Laura Bounnhaseng

Laura Bounnhaseng

Director of Operations and Client Service
Office 415-733-6562

Laura runs the insurance client services division. She is our specialist for all insurance services. Laura also assists with team projects and day to day operations.


Laura brings knowledge and experience from the financial and banking industries for over 13 years.  She is a graduate of California State University of Fresno with a B.S. in Business Administration, Finance Option. She currently holds Series 6, Series 63, and California Life & Health licenses.


Laura lives in Fremont, CA with her three children – Nya, Vera, and Royce. In her spare time, she enjoys traveling, the outdoors, and being in the company of friends and family.


Schedule time with Laura: Laura's Calendar 





Together, we are committed to providing exceptional customer service to all of our clients.

If you need to schedule an appointment, make changes to your policy, submit a claim or make any other requests, please let us know.

Leslie Widmann

Leslie Widmann, MBA, CLU®

Associate Wealth Management Advisor
Office 415-733-6529

A graduate of Harvard University with an MBA from the Haas School of Business at UC Berkeley, Leslie Widmann works closely with clients and spearheads the practice’s marketing operations. She has over 20 years of experience in business leadership and operations and holds Series 7 and Series 63 licenses as well as her California Life & Health License.

Leslie first met the Walther team as a client and was so compelled by the thoughtful and creative approach to planning that she joined the team. Originally from Massachusetts, Leslie now lives in the Hayward Hills east of San Francisco with her husband Dan and their daughter Erin. In her free time she enjoys making ice cream, volunteering at Erin’s school, and hiking the beautiful Bay Area trails just outside their house.

Schedule time with Leslie:  Leslie's Calendar

Katelynn Wiley

Katelynn Wiley

Office 415-733-6551

Katelynn provides day to day operational support for insurance client services and financial planning. 

A graduate of the University of California, Berkeley with a B.A. in Peace and Conflict Studies, she comes to the team with a community-minded background in non-profit management and local business marketing. 

Outside of the office, Katelynn is an amateur tiny house builder, avid reader, and adventure-seeking traveler. She lives in Petaluma with a big dog and a regular-sized partner who are both named Max. 


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

Visit our Client Relationship Summaries (Form CRS) which provide brief information about our firms that provide brokerage services and advisory services.