Potential clients of northern Arizona defense attorney L. Matthew Springer are often reassured when they learn of his 100 percent commitment to criminal justice. Criminal defense is all he does. As a sole practitioner, he works only for each client. Clients of L. Matthew Springer, Attorney at Law, work directly with an aggressive, effective defender of their rights. Contact a criminal defense lawyer in Flagstaff after you have been charged with any crime: DUI, a drug crime, assault, theft, domestic violence, a sex crime or a white collar crime.ld definitely recommend.?