He lived on the east side of Plegmund's Bridge and had a rivalry with Matilda Vermentino, owner of Vermentino Vineyard, which is located on the west side. This rivalry came to a head when Count Vladimir Crespi, owner of the large and successful Belgaard Vineyard in southern Toussaint, was killed by The Beast of Beauclair, leaving his estate up for grabs.
If Geralt helps him after helping Matilda get Belgaard: he'll be sad knowing he'll have to stick with being a small time wine supplier, but at least he won't go bankrupt now that his problems are fixed.
If Geralt helps him take over Belgaard: he'll gladly become steward of the vineyard and most likely becomes a huge supplier of wine.
If Geralt helps both but doesn't investigate the saboteur before the second part of Wine Wars: Belgaard: the two will grudgingly enter a partnership to run Belgaard together, but show resentment towards each other.
If Geralt ends Liam and Matilda's feuding: the two will happily enter a partnership, combining all three vineyards and, realizing they were attracted to each other, a relationship soon sprung up between them.