Marco Gandolfi has been a member of the organization since 1991.

He is particularly interested in oil tasting and has been involved in this area since 1992, when he became a Professional Tasting Member. He has been a member of the ONAOO Official Panel since 2004 and has obtained the qualification of Panel Leader.

By participating annually in refresher courses organized by ONAOO, he has had the opportunity to deepen his knowledge and satisfy his curiosity about the vast world of olive oil. Over the years, he has participated as a judge in important national and international competitions.

He was born in Genoa in 1966. In 1992, he founded the company “Lorenzo Costa fu Eugenio 1860”, of which he still is the administrator. The company deals with door-to-door sales of extra-virgin olive oil and other food products. In 1996, he was granted the certificate of Professional ONAOO taster.

In 2019, Diana and her husband initiated the establishment of a modest olive grove in the Marche region of Italy.

As a result of the substantial increase in production, they made the decision to sell their business in the Netherlands. Currently, the company’s exclusive focus is on the production of extra virgin olive oil in Italy under the Di Lorenzetto brand, which is renowned for its superior quality.

To further refine the quality of their oil and gain a deeper understanding of the varieties, flavors, health properties, and defects of olive oil, Diana decided to embark on a training course. She began with a tasting course in Madrid, followed by a technical course and an advanced one at O.N.A.O.O., concluding her studies in november 2024 with the qualification of Professional Taster. In 2024, she also obtained her olive oil sommelier certification at the International Culinary Institute in New York.

Since 2019, Diana has been a member of the Olive Oil Institute panel from the Netherlands. She also regularly conducts workshops and masterclasses for schools, chefs, amateur cooks, and olive oil enthusiasts in the Netherlands and Italy.

Antonella has been an ONAOO professional taster since 2017.

After obtaining her sensory certification, she has been a member and judge of the Swiss Olive Oil Panel (SOP) at the ZHAW School of Life Sciences and Facility Management since 2002.

Since 2002 she has been a judge for the “ZHAW International Olive Oil Award” and other international competitions. She is the owner and managing director of “Mitera GmbH”: a producer of Cretan millennial quality olive oil, approved by DNA in both Crete and Umbria. She is also a nutritionist.