Answer by taking a quote from the following article:

Dave Holland (born 1 October 1946) is an English jazz double bassist, composer and bandleader who has been performing and recording for five decades. He has lived in the United States for over 40 years. His work ranges from pieces for solo performance to big band. Holland runs his own independent record label, Dare2, which he launched in 2005.

During the 1990s, Holland renewed an affiliation, begun in the 1970s, with Joe Henderson, joining the tenor saxophonist on So Near (So Far), a tribute to Miles Davis, and Porgy & Bess. Holland also reunited with vocalist Betty Carter, touring and recording the live album Feed the Fire (1993). Fellow Davis alumnus Herbie Hancock invited Holland to tour with him in 1992, subsequently recording The New Standard. Holland joined Hancock's band again in 1996. He was also part of the sessions for River: The Joni Letters, winner of the 2008 Grammy Award for Album of the Year.  As a leader, Holland formed his third quartet and released Dream of the Elders (1995), which introduced the vibraphonist Steve Nelson to his ensembles. Holland formed a quintet that includes tenor saxophonist Chris Potter, trombonist Robin Eubanks and, a more recent addition, drummer Nate Smith. Their recordings include Points of View, Prime Directive, Not for Nothin, Extended Play: Live at Birdland and Critical Mass. In addition to releasing four quintet albums on ECM, Holland debuted his Big Band, which released What Goes Around in 2002. The album won Holland his first Grammy as a leader, in the Best Large Jazz Ensemble Album category. The second Big Band recording, Overtime (2005), again won the Grammy in the Best Large Jazz Ensemble Album category; it was released on Holland's Dare2 label, which he formed that year.  In 2009, Holland was a co-founder of an all-star group called the Overtone Quartet. The group consisted of Holland on bass, Chris Potter on tenor saxophone, Jason Moran on piano, and Eric Harland on drums. The group toured extensively throughout the United States and Europe.

What was he doing in the early 1990S?
touring and recording the live album Feed the Fire (1993). Fellow Davis alumnus Herbie Hancock invited Holland to tour with him in 1992,