Volumetric Fund has a well-experienced and dedicated team of industry professionals. From our knowledgeable portfolio managers to our committed board of directors, in conjunction with our auditors, banks, custodian, trustee and brokers, we are all committed to quality and service of our shareholders.


Irene Zawitkowski
Chair, CEO,
Senior Portfolio Manager

Irene Zawitkowski was born in 1953 in New Jersey. She has a B.S. degree in Accounting and received an MBA degree in Finance from Fairleigh Dickinson University in 1978. 

Ms. Zawitkowski was working at Lonza, Inc. as an accounting supervisor in the mid 1970s. She assisted Mr. Gibs in setting up Volumetric in 1978. She has been an officer of the Fund since inception. She served as President and Portfolio Co-Manager from September 2003, to April 2016.  In 2016, Ms. Zawitkowski was appointed CEO and Senior Portfolio Manager of the Fund and in June 2018, Ms Zawitkowski was appointed Chair of the Board. She is also Executive Vice President of Volumetric Advisers, Inc.


Ms. Zawitkowski is married and has two children.  

Irene Zawitkowski

A Mutual Fund

with a Difference

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Gabriel Gibs
Former CEO, Chair and Portfolio Manager

Gabriel Gibs was born in Budapest, Hungary in 1936. He came to the United States in 1957 as a college student. Initially, he attended the University of California at Berkeley as a chemical engineering major, before he moved to New York. He received a B.S. degree in Chemistry in 1963, at what is now the City University of New York (CUNY). He has also received a M.B.A. degree in Finance from Pace University in 1974. The principles of his MBA thesis, titled "Forecasting Stock Trends By Volume Analysis", has been the foundation of  the Volumetric Fund's trading system. 

After graduation Mr. Gibs' first job was a chemist in the Lederle Division of American Cyanamid Co., since acquired by Pfizer, in Pearl River, New York. Then, from 1968 to 1975, he worked for St Regis Paper Company, now part of International Paper, as a chemist. During these years he became very interested in the stock market as a hobby. 

Between 1975 and 1986 he was employed in various capacities by Lonza, Inc., a chemical company in Fair Lawn, New Jersey. He started Volumetric Fund in 1978, as 17 co-workers, friends, and relatives invested their money in the new investment club. In 1986, as Volumetric kept growing, Mr. Gibs left Lonza to manage the fund full time. In September of 1987, Volumetric Fund went public. 

Mr. Gibs has served as a Portfolio Manager since inception to April 2021. He served as CEO from 1978 to April 2016 and Chair from 1978 to June 2018. He was appointed Chairman Emeritus in June 2018 and former President of Volumetric Advisers, Inc, the Fund's investment adviser.

Mr. Gibs has been a guest on various television and radio shows and was interviewed numerous times for newspaper articles. Mr. Gibs is married and has two children and four grandchildren. 

Jeffrey Gibs
President, Portfolio Manager, Chief Compliance Officer

Jeffrey Gibs was born in 1966 and raised in New York.  He attended Monmouth University, where in 1988 he earned a B.S. degree in Business with concentration in Computer Systems.


Mr. Gibs began his investment industry career in 1988 at Chase Manhattan Bank (now J.P. Morgan Chase) in the global custody area for the U.S. Private Banking Division.  Thereafter, Mr. Gibs had worked several years for two separate investment advisers, managing their back and middle office operations and held the position of compliance officer. Most recently, he was Vice President and manager of a hedge fund administration group at US Bank. In addition to these companies, Mr. Gibs has served as a consultant to Volumetric Fund since 1988 and was employed full time as Vice President from 1997 to 2001. He has served as Volumetric Fund’s Chief Compliance Officer (CCO) since 2007.

In 2015, he became a full time employee again. From  2015 to 2016 he served as Executive Vice President and in 2016, he was appointed as President and Portfolio Manager to Volumetric Fund. He performs a vast area of responsibilities in the areas of  portfolio management, operations, accounting, shareholder relations, compliance and marketing.

Jeffrey is the son of Gabriel Gibs, Founder and Chairman Emeritus, of Volumetric Fund. He is married with two children.



BBD, LLP - Independent Registered Public Accounting Firm
First National Bank of Omaha - Custodian of Retirement Accounts
NRS - Blue Sky Services
Thompson Hine LLP - Legal Counsel
Ultimus Fund Solutions - Transfer Agent and Fund Accountant
Ultimus Fund Distributors, LLC - Mutual Fund Distributor
US Bank - Custodian for Assets

You should carefully consider the investment objectives, potential risks, management fees, and charges and expenses of the Fund before investing. The Fund's prospectus contains this and other information about the Fund and should be read carefully before investing. You may obtain a current copy of the Fund's prospectus by calling 1-800-541-FUND. Distributed by Ultimus Fund Distributors, LLC. (Member FINRA)