Jennifer Welter (born October 27, 1977) is an American football player and coach who coached inside linebackers for the National Football League’s Arizona Cardinals during their training camp and the 2015 preseason. The signing with the Arizona Cardinals made her the first female coach in the NFL. This is her third “first” for men’s football in 2014 and 2015. 
On February 12, 2015, the Indoor Football League’s Texas Revolution named Welter their linebackers and special teams coach making her the first woman to coach in a men’s professional football league.
On January 24, 2014, the Revolution announced signing 5 ft 2 in (1.57 m), 130 lb (59.0 kg) Welter as a running back. This made her the second female player for a position other than kicker or placekick-holder on a men’s professional football team, and the first at running back. She is not the first female to play a male dominant sport; however, she is the first woman to play a “contact” position in a male dominant sport.
Welter was featured in Mogul’s #IAmAMogul campaign as part of Women’s History Month in March, 2016 for “changing the perception of what it means to be an NFL coach.”
On November 19, 2015, Welter was presented with the Women’s Entrepreneurship Day Sports Pioneer award at the United Nations.