ESS Board of Trustees

Leonard M. Rush

Lead Independent Trustee, Audit Committee Chair

Len Rush has served in several different senior executive roles at various global financial services firms. Most recently, Mr. Rush served as Managing Director and the Chief Financial Officer of Baird, Baird Holding Company, Baird Financial Corporation and is the Treasurer for Baird Funds. Prior to joining Baird in 2000, Mr. Rush spent nine years at Fidelity Investments, where he was CFO of its four broker dealers, Vice President/ Head of Compliance and Assistant Treasurer for the funds. Prior to Fidelity, Mr. Rush was a Vice President at Credit Suisse First Boston, a Manager with Goldman, Sachs & Co. and a Senior Manager with Deloitte & Touche. Mr. Rush holds a BBA, with a focus in Accounting, from the University of Wisconsin-Madison and a Masters of Business Administration from New York University. Mr. Rush is also a Certified Public Accountant.

David Massart

Independent Trustee

David A. Massart is a co-founder, Chief Investment Strategist and President of Next Generation Wealth Management, Inc., a SEC registered investment advisory firm. Mr. Massart has 18 years of financial experience working with high net worth individuals, families, trusts and retirement accounts. David’s responsibilities include: setting the firm’s overall strategy, strategic and tactical asset allocation decisions, investment manager evaluation/selection and client relationship management. He is the lead member of Next Generation Wealth Management’s Investment Committee. Prior to co-founding Next Generation Wealth Management, Mr. Massart was a Manager at Wells Fargo Investments, LLC and a Managing Director of Strong Private Client. With David’s leadership and entrepreneurial spirit, he was responsible for building a wealth management team that managed over $275 million in client assets. Mr. Massart has been a featured presenter on a broad range of wealth management issues, including asset allocation, portfolio design, tax aware investment strategies and implementation of investment best practices over the past eighteen years. Mr. Massart holds an undergraduate degree in Business Management from the University of Minnesota where he was awarded a varsity tennis scholarship, receiving a Bierman Academic Scholar for 3 consecutive years. Mr. Massart’s team won two Big Ten Men’s Tennis Championships and was selected by his teammates as a co-captain during his senior season. Mr. Massart co-founded Next Generation Philanthropy, LLC and is the founder of Next Generation Entrepreneurs Group. Mr. Massart serves on several advisory boards in Wisconsin.

Janet D. Olsen

Independent Trustee

Ms. Olsen has substantial industry experience, including over a decade serving as a senior executive of an investment management firm and a related public company, as well as an executive officer of another investment company from 2001 to 2012. Ms. Olsen most recently served as Managing Director and General Counsel of Artisan Partners Limited Partnership, a registered investment adviser serving primarily investment companies and institutional investors, and several affiliated entities, including its general partner, Artisan Partners Asset Management Inc. (NYSE: APAM), and as an executive officer of Artisan Funds Inc.

Mike Castino

Interested Trustee

Mike Castino serves as business development officer for the Exchange Traded Funds and Unit Investment Trusts division. Mr. Castino joined U.S. Bancorp Fund Services in 2013 with more than 20 years of business development, relationship management, marketing, managerial experience,and futures/equity trading experience. Prior to joining U.S. Bancorp Fund Services, Mr. Castino worked for Zacks Investment Management as managing director of the Index Services Division. He also held the position of vice president of Institutional Sales for Claymore ETFs (now Guggenheim Funds) and was senior floor trader at the Chicago Mercantile Exchange for a major Wall Street trading firm. Mr. Castino received his Bachelor of Arts degree in business management from Illinois State University and is Series 7 and 66 licensed.

Kristina Nelson


Kristina Nelson serves as fund administrator for a select group of mutual fund and ETF clients. Kristina manages a team responsible for SEC filings, board materials, distributions, monitoring fund compliance as well as assisting in the overall accounting and operations of the funds. Kristina currently also serves as the president for ETF Series Solutions, a Multiple Series Trust complex serviced by Global Fund Services. Kristina has more than 15 years of experience in accounting and financial reporting. Prior to joining U.S. Bank in 2010, Kristina was a senior assurance associate with Grant Thornton. Kristina received her Bachelor of Arts in accounting and information systems from Carthage College.

Michael D. Barolsky

Vice President and Secretary

Michael D. Barolsky, Esq., is a manager with Regulatory Administration, which he joined in May 2012. Michael provides legal assistance, primarily with respect to the registration and regulation of exchange-traded funds (ETFs) and mutual funds. His work includes the formation of new investment companies, assisting advisers in obtaining exemptive relief, and the registration of new funds, as well as educating ETF advisers and sponsors about regulatory requirements and issues affecting product design and fund operations. Additionally, Michael serves as an officer of ETF Series Solutions, a series trust organized by Global Fund Services, where he has helped more than 25 ETF sponsors bring products to market. Prior to joining the bank, Michael practiced in the investment management group at a national law firm, where his legal experience focused on counseling investment companies and investment advisers in all aspects of compliance with federal and state securities laws. Before practicing law, he was a management consultant in the strategy and operations practice of a Big 4 consulting firm, working with companies across the financial services, telecommunications and health care sectors. Michael received his Juris Doctor from the George Washington University Law School and holds a Bachelor of Arts in global business and political dynamics and a bachelor’s in business management from Boston University.

Kristen Weitzel


Kristen Weitzel, CPA, serves as fund administrator for a select group of clients. She was a project manager on the establishment of exchange-traded fund servicing at Global Fund Services and is now a member of the ETF Fund Administration team. Additionally, Kristen serves as an officer of ETF Series Solutions, a series trust organized by Global Fund Services. Kristen has more than 12 years of experience in the financial services industry. Prior to joining U.S. Bank in 2011, Kristen was an audit manager with PricewaterhouseCoopers, specializing in auditing and assessing the internal control structure of regulated investment companies, hedge funds, broker-dealers and other financial services organizations. Kristen received her Bachelor of Business Administration and Master of Accountancy degrees from the University of Wisconsin Madison.

James Butz


James Butz has served as a compliance officer in the Regulatory Support Services department since 2011 and currently serves as the Chief Compliance Officer for the ETF Series Solutions Trust. James joined U.S. Bank in 2006 as a mutual fund specialist in the Transfer Agent and was promoted to operations manager in the Transfer Agent in 2007. He has more than 10 years of experience in the mutual fund and ETF industry.

James earned his Bachelor of Business Administration degree in finance from the University of Wisconsin Milwaukee. He is a member of the National Society of Compliance Professionals (NSCP) and has been a panelist at NSCP National Conferences. He is also a member of the National Investment Company Service Association (NICSA) and serves on the NICSA Transfer Agent Committee.