Alongside his producing partner, Broderick Johnson, he is the co-founder and co-CEO of Alcon Entertainment, a Los Angeles–based film and television production and financing company.

[3] Kosove and Johnson moved to Los Angeles, California, where they started a film production company with financial capital from Frederick W. Smith, the founder and chairman of FedEx.

I Love You, Dude, Where's My Car?, The Sisterhood of the Traveling Pants, The Book of Eli,[2] Insomnia (the first studio distributed film for director Christopher Nolan), and Denis Villeneuve's Prisoners.

The following year, Alcon Entertainment produced and financed Dolphin Tale, another modestly budgeted family film that grossed $100M in worldwide box-office.

Kosove was nominated for an Emmy Award as an executive producer on the documentary, Sinatra: All or Nothing At All (directed by Alex Gibney) in 2015.