With clients all across the United States, we are happy to come to you. 


Leslie Lammers of Riverstone Advisors

Leslie J. Lammers, CFA

Leslie founded Riverstone in 2004 to manage client accounts that she has invested since 1993. These clients are the bedrock of Riverstone today.  She founded Riverstone to have the freedom to do the right job for clients. She thinks that portfolios should be tailored to an individual’s needs. Her ability to see, understand, and analyze a market, demographic, or business trend provides your basis for investing success.

Leslie believes that there are great investments out there and that it is her job to find them.  She calls this the “so many boys (girls) at the dance” concept.  

Leslie is the Chief Executive Officer and Co-Chief Investment Officer of Riverstone Advisors. She is a CFA charterholder and lives in New Braunfels, TX.

She sits on the Investment Committee of the New Braunfels Community Foundation.

When Leslie is not working, she enjoys spending time with family and friends, dancing, and listening to live music at Gruene Hall.  She has been married to Tom forever and is blessed with two daughters.  

John A. Hanson, CFA

John joined Riverstone in 2012 and is currently the Co-Chief Investment Officer and Portfolio Manager. An engineering graduate of the Georgia Institute of Technology, John brings a keen analytical eye to investment opportunities and financial planning scenarios.

Prior to joining Riverstone Advisors, John previously worked in investment banking at SunTrust Robinson Humphrey in the Mergers and Acquisitions group. Prior to SunTrust, John also spent time in the corporate finance group at Porsche Cars North America. These previous experiences helped John sharpen his analytical framework that is used everyday at Riverstone Advisors. 

John decided to leave the investment banking and corporate finance worlds because he likes helping people.  

He is currently a board member of the GT Alumni Association Board of Trustees and is also on the Atlanta Juvenile Diabetes Research Foundation (JDRF) Board of Directors.

When John is not working, he enjoys spending time with his family, fly fishing and participating in triathlons.

Allison Rickerson
Client Services and Operations Associate

Allison joined Riverstone at the end of 2018 and serves as the Client Services and Operations Associate. Prior to working for Riverstone, Allison graduated from The University of Texas of the Permian Basin and was a classroom educator for the Texas school system. She left the classroom to raise her kids and worked as an office manager for a family owned business. She brings to Riverstone organizational skills and a keen attention to detail.

Outside of work, Allison volunteers to teach a women’s Bible Study and mentors college and young adults through her church. Allison is married with 3 kids who keep her very busy with their many sports and activities. She enjoys reading, being crafty and loves to travel with her family. On her bucket list is to visit all the Major League Baseball parks.