The pandemic-driven economic turmoil hit Liberty Oilfield Services hard, forcing it to drastically cut spending and lay off roughly 1,000 of its 2,400 employees. Times are still tough, but Chris Wright, CEO of the Denver-based company, said things are looking up. Liberty has rehired many workers. Its revenue has been increasing each month since May. And later this year, Liberty will close on its acquisition of Schlumberger’s North American hydraulic fracturing unit.