Our Team
Our Team
As a client, you’ll be supported by a team of experts who are dedicated to helping you achieve your financial goals. Client service is of utmost importance to us.
William Tanner
Co-Founder and Chairman, Co-Equity Portfolio Manager
William Tanner, Co-Founder, Chairman, Equity Co-Portfolio Manager
Bill Tanner is the Chairman and Co-Equity Portfolio Manager of AMI Asset Management. He Co-Founded the firm in 1994, has been the portfolio manager since the inception of the firm and is still a member of the firm’s Investment Committee. Mr. Tanner began his career in public accounting auditing small and medium-sized companies before co-founding the CPA/Business Management firm Tanner Mainstain Glynn & Johnson in 1975. He earned a degree in Business Administration and Accounting from the University of California, Los Angeles and a Master’s Degree in Taxation. Mr. Tanner is a shareholder of the firm. He is also a longtime board member of the UCLA Jonsson Cancer Center Foundation.
Peter Mainstain
PartnerPeter Mainstain, Partner Peter Mainstain, CPA is a shareholder of the firm. He has been a practicing Certified Public Accountant since 1972 and has extensive experience in all phases of the entertainment and sports industries, including personal business management as well as financial and retirement planning. Mr. Mainstain co-founded the CPA/Business Management firm Tanner, Mainstain, Glynn & Johnson in 1975, which is now part of Ground Control Business Management. Mr. Mainstain holds a Bachelor of Science in Business Administration and Accounting from California State University, Northridge, and has done post-graduate study at USC and Golden Gate University. He has taught at UCLA Extension and has been a guest lecturer at industry and professional organizations. Mr. Mainstain is a member of the American Institute of Certified Public Accountants as well as the California Society of Certified Public Accountants. [email protected]
Matthew Humiston
President
Matthew Humiston, President
Matt Humiston is responsible for running the day-to-day operations of AMI. When Mr. Humiston joined the firm in 2000, he and Bill Tanner formulated the investment process that AMI uses today. Mr. Humiston oversees the portfolio management trading and reporting operations. Prior to joining AMI, Mr. Humiston worked at internet startup Pop.com and at Brillstein-Grey Entertainment. He earned a Bachelor of Arts in Economics degree from the University of California, Santa Barbara. He also received a professional designation in Personal Financial Planning (PFP) at the University of California, Los Angeles in 2005. Mr. Humiston is a shareholder of the firm.
Christian Sessing, CFA
Chief Investment Officer, Lead Equity Portfolio Manager
Christian Sessing, CFA, Chief Investment Officer, Lead Equity Portfolio Manager
Christian Sessing leads the equity research efforts for the firm and is responsible for the portfolio construction for all of the firm’s equity strategies. He began his career as an Equity Analyst with a regional brokerage firm and then spent 5 years at Crowell, Weedon & Co. He earned a Bachelor of Business Administration with a concentration in Finance from California State University, Northridge. His professional and business activities consist of being a member of the CFA Institute. Mr. Sessing has been with the firm since 2005 and is a shareholder.
Katharine Kim
Chief Compliance Officer
Katharine Kim, Chief Compliance Officer
Katharine Kim is responsible for the day-to-day implementation and maintenance of the firm’s compliance program to ensure compliance with all industry regulations. Mrs. Kim coordinates all the audits at the firm, including the annual GIPS audit. She also oversees the daily management of client accounts and the the administration of new accounts. Mrs. Kim began her career performing client services duties at Dreyfus Brokerage Services. She earned a Bachelor of Arts in Economics degree from the University of California, San Diego. Mrs. Kim has been with the firm since 2002 and is a shareholder.
Andrew Zamfotis, CFA
Co-Equity Portfolio Manager
Andrew Zamfotis, CFA, Portfolio Manager
Andrew Zamfotis is responsible for assisting in all phases of the equity research process. Prior to joining AMI, Mr. Zamfotis was a Senior Analyst at EVA Dimensions, an equity research firm focused on economic profit-based models whose clients manage over $100 billion. Prior to EVA, he was a senior analyst at the long/short hedge fund Legarde Capital Management. Mr. Zamfotis began his career at the Halyard Capital Fund, a private equity fund where he was responsible for the Fund’s investments into Technology, Media, Internet, and Telecommunications companies. He holds a Bachelor of Science in Finance and Information Systems degree from New York University’s Stern School of Business where he graduated with honors. He is a CFA® Charterholder and has been with the firm since 2015. Mr. Zamfotis is a shareholder of the firm.
Richard Schimbor, CFA
Senior Equity Analyst
Richard Schimbor, Equity Analyst
Richard Schimbor is responsible for assisting in all phases of the equity research process, including model construction, news and event tracking, and research projects. Mr. Schimbor began his career at Falcon Point Capital, a long short hedge fund in San Francisco. Most recently Mr. Schimbor served as an Assistant Vice President at U.S. Bancorp. Richard has held internships in equity research with Trust Company of the West and Dalton Investments. Mr. Schimbor received a B.A. in Economics with Highest Honors from the University of California, Berkeley and an M.B.A from the UCLA Anderson School of Management. Mr. Schimbor is a CFA® Charterholder and has been with the firm since 2016.
Andrhe Cunha
Equity Analyst
Andrhe Cunha, Equity Analyst
Andrhe Cunha is responsible for assisting in all phases of the equity research process, including model construction, news and event tracking, and research projects. Mr. Cunha began his career as an Equity Research Intern at Wedbush Securities, a privately held investment firm based in Los Angeles. Mr. Cunha received his B.S. in Business Administration with Highest Honors from the Marshall School of Business at the University of Southern California. Mr. Cunha has been with the firm since 2023.
Daniel Schniedwind, CFA
Managing Director – Fixed Income
Daniel Schniedwind, Managing Director – Fixed Income
Daniel Schniedwind is responsible for managing the firm’s tax-exempt, taxable and high yield fixed income strategies. Prior to joining the firm, Mr. Schniedwind was a Senior Credit Analyst at Denver Investments for 5 years. Mr. Schniedwind started his career as a Credit Analyst/Portfolio Assistant at AMI Asset Management. He earned a Masters of Science degree in Finance from Indiana University and a Bachelors of Arts degree in Economics from Whittier College. Mr. Schniedwind is a CFA® Charterholder and rejoined the firm in 2019.
Matthew Dorband
Director of Sales and Marketing
Matthew Dorband, Director of Sales and Marketing
Matt Dorband leads the marketing and sales efforts of the firm. He is responsible for developing and executing the firm’s business development plan for promoting the equity strategies within the institutional investment community. He previously spent 13 years in the commercial real estate industry at CB Richard Ellis and Colliers International focusing on assisting businesses with corporate real estate planning. Mr. Dorband earned a Bachelor of Science in Business Administration degree with an emphasis in Finance and Entrepreneurship from the University of Arizona. Mr. Dorband has been with the firm since 2012.
Andrew Wood
Head of Advisory Distribution
Andrew Wood, Director, Head of National Accounts
Andrew Wood leads the Broker-Dealer Client Coverage for the Firm. Prior to joining AMI, Mr. Wood spent 11 years at Morgan Stanley where he was most recently a Partner and the Chief Operating Officer for The Gage Group, a boutique family wealth advisory group based in Morgan Stanley’s Beverly Hills Office. Before that, Mr. Wood served as the Business Development Manager for Morgan Stanley’s Beverly Hills, Westwood and Santa Monica Offices. Mr. Wood began his career as an Equity Product Specialist for Morgan Stanley in New York City. Andrew graduated from Columbia University with a Degree in Economics. During his time at Columbia, he was also a four year-member of the Men’s Varsity Swim Team. He remains actively involved in his alma mater as a Board Member of Columbia’s Young Leaders Council, Young Alumni Board and Club of Southern California. Mr. Wood has been with the firm since 2024.
Erin Gudino
Operations Associate
Erin Gudino, Operations Associate
Erin Gudino assists in the daily management of client accounts and administration of new accounts. Mrs. Gudino previously worked as an administrative assistant at KPMG LLP in Boston. She earned a Bachelor of Arts in Media Studies degree from Sacred Heart University. Mrs. Gudino has been with the firm since 2010.
Christopher Guerrero, CISO
Equity Trader, IT
Christopher Guerrero, Equity Trader, IT
Christopher Guerrero is responsible for managing AMI’s IT operations, as well as assisting with equity trading and coordinating proxy voting. Previously, Mr. Guerrero worked at Tanner, Mainstain, Glynn & Johnson for 17 years as the IT Director. He received a Bachelor of Sciences in Psychology and Political Science degree from the University of California, Los Angeles. Mr. Guerrero has been with the firm since 2014.
Andrew Kim
Equity Trader, Operations Associate
Andrew Kim, Equity Trader, Operations Associate
Andrew Kim is responsible for implementing the equity trading for AMI. He also assists in the daily management of client accounts, the maintenance of the performance composites and the annual audits. Previously, Mr. Kim worked in the technology sector and later transitioned into an operational role in renewable energy. He received his Bachelor of Science in Theoretical and Mathematical Physics from the University of Washington. Mr. Kim has been with the firm since 2025.