Clark won the Summit League's Defensive Player of the Year award in 2008 and was named to the All-Midwest Regional First Team.

[7] With little money in his bank account, Clark sold most of his belongings so he could afford to travel to Europe in an attempt to find a club.

[8][5] In December 2009, Clark was offered a trial by 4th-tier English club Bradford City, but he eventually left due to being unable to obtain a UK work permit.

[9][10] In January 2010, Clark signed a one-year contract with Tippeligaen club Hønefoss BK after impressing the coaches during his 1-day trial.

Clark helped lead Hønefoss to the Adeccoligaen title, appearing in all 30 games and keeping 12 clean sheets.

[16] Clark enjoyed a good season in 2012, playing in all 30 league games and keeping 9 clean sheets for Hønefoss, helping the club finish in 13th, 2 places and 3 points above the relegation zone.

The Sounders received a 2015 MLS SuperDraft fourth-round selection in exchange for sending Clark's rights to Columbus.

[37] He then made an additional 6 appearances in the relegation playoffs, helping ACH beat Vendsyssel FF 3–1 on aggregate in the third round to remain in the Superliga.

[48][49] He made his Timbers debut on September 1, coming off the bench and giving up a goal in a 1–1 draw against the New England Revolution after starting goalkeeper Jeff Attinella hurt his hamstring.

[45][51] In Attinella's first game back, he had to be subbed off due to a shoulder injury, with Clark coming in to finish off the 0–0 draw with FC Dallas.

Clark ended the season with 8 appearances and 3 clean sheets for the Timbers, helping Portland finish 5th in the Western Conference.

[54] He ended the regular season with 24 appearances and 6 clean sheets, helping the Timbers to a 6th-place finish in the West, qualifying for the playoffs.

[54] He also played in all 4 of Portland's Open Cup games as they reached the semifinals, where they lost 2–1 to Minnesota United FC.

Play resumed in July with the MLS is Back Tournament, with the 3 group stage games counting as regular season matches and the knockout round used to determine a CONCACAF Champions League berth.

[57] He started all 4 knockout round games as the Timbers reached the final, where they beat Orlando City SC 2–1.

He ended the shortened regular season with 20 appearances (out of a possible 23) and kept 5 clean sheets, helping the Timbers finish 3rd in the Western Conference.

[38] On April 18, in Portland's first MLS game of the season, Clark had to come off in a 1–0 loss to Cascadia Cup rivals Vancouver Whitecaps FC due to a thigh injury.

[60][61] He would miss the Timbers next 6 MLS games and the CCL quarterfinal matchup with Club América, a 4–2 aggregate loss.

[60] Portland finished 4th in the West, with Clark making 24 appearances and keeping 7 clean sheets in regular season play.

[60][62] In the playoffs, Clark played every minute of Portland's 4 games and kept 2 clean sheets, helping the Timbers reach MLS Cup 2021, where they lost 4–2 on penalties to NYCFC.

[63] He made his Dynamo debut on February 27, 2022, keeping a clean sheet to give Houston a 0–0 draw with Real Salt Lake in the opening game of the season.