The Tequila-Sherry Connection

Every time I look for sherry I find tequila there too. What is it with the tequila people and the sherry people being the same people?  

Steven Olson aka Wine Geek is both a tequila and mezcal ambassador and also a sherry ambassador. 

Jacques Bezuidenhout, Partida tequila brand ambassador and sometimes sherry ambassador, also created of the La Perla cocktail with both tequila and sherry. 

George Sandeman of the Sandeman sherry and port family is a huge tequila fan. 

On a recent trip to Spain with Steve Olsen were Phil Ward and Katie Stipe of Mayahuel, the tequila-and-mezcal bar in New York. 

Gitane restaurant in San Francisco has a drink with tequila, PX, lime, and ginger beer. 

And just the other day I got a recipe pitch from Espolon tequila with this recipe from H. Ehrmann of Elixir:

Ashes to Ashes

1.5 oz. Espolón Tequila Reposado
.5 oz. Pedro Ximenez Sherry
1 oz. Lemon Juice
1 tsp. Sweetened Cocoa Mix
.25 oz. Agave Nectar
1 pinch Ground Cinnamon

Place all ingredients in a mixing glass, fill with ice, cover and shake well for 10 seconds. Strain up into a cocktail glass. Garnish with cinnamon dust.

I also love both sherry and tequila, but I don't know what they have to do with each other. 

What gives?