OPINION
Barry David Glick pled guilty to interstate transportation of stolen property. 18 U.S.C.A. § 2314 (West Supp.1991). The sentencing court departed downward from the sentencing guidelines range on the bases of Glick's aberrant behavior and diminished capacity, and sentenced him to five years probation. The government appeals the downward departure. We reverse in part, affirm in part, and affirm as to the result.
I.
Prior to oral argument, Glick moved that I recuse myself because I presently serve as the Chairman of the United States Sentencing Commission. The motion is denied by a unanimous vote of the panel.
The Sentencing Reform Act requires that at least three of the seven members of the United States Sentencing Commission be federal judges. 28 U.S.C.A. § 991(a) (West Supp.1991). The Supreme Court has upheld the constitutionality of permitting federal judges to serve on the Commission. Mistretta v. United States,
In an earlier case involving the appeal of a sentence, Chief Judge Stephen G. Breyer, United States Court of Appeals for the First Circuit, and former member of the Sentencing Commission, siia sponte raised the question whether he should disqualify himself from hearing that appeal. United States v. Wright,
A judge must recuse himself from a "proceeding in which his impartiality might reasonably be questioned." 28 IJ.S.C.A. § 455(a) (West Supp.1991). "The inquiry is whether a i~easonable person would have a reasonable basis for questioning the judge's impartiality. . . ." In re Beard,
The United States Sentencing Commission promulgates guidelines and policy statements that have general application. The Supreme Court recognized in
Mistretta
that the promulgation of these guidelines “is an essentially neutral endeavor and one in which judicial participation is peculiarly appropriate.”
Appellant argues that a judge-commissioner would have difficulty basing a decision on the text of the guidelines, commentary, and policy statements alone and that the knowledge of the guidelines promulgation process possessed by a judge-commissioner could improperly influence such a decision. Judges, however, are often called upon to compartmentalize their knowledge of information surrounding a case. For example, during a bench trial a judge is required to rule on the admissibility of evidence, and then to render a verdict without considering the inadmissible evidence. See, e.g., Fed.R.Evid. 403. Importantly, in ruling on guidelines issues, a judge-commissioner, like all judges, is statutorily confined to “consider only the sentencing guidelines, policy statements, and official commentary of the Sentencing Commission.” 18 U.S.C.A. § 3553(b) (West Supp.1991).
Appellant also questions the propriety of a judge deciding guidelines cases and simultaneously serving on the Commission because of the role a commissioner might play in subsequently amending the guidelines and policy statements. This possibility has no bearing on a judge’s ability to be impartial. Any future amendment would have no effect on a defendant previously sentenced, except possibly to qualify the defendant for a sentence reduction. United States Sentencing Commission, Guidelines Manual, § 1B1.10, p.s. (Nov. 1990).
Because no special circumstances that would cause a reasonable person to question my impartiality are presented by this appeal, I shall not recuse myself. Indeed, because recusal is not required, I am obligated to participate.
II.
While working for Arbitron Company, Glick mailed an anonymous letter containing confidential information to Arbitron’s principal competitor, A.C. Nielsen Company. Glick offered to become a consultant for Nielsen and suggested that Nielsen place an advertisement in a trade journal requesting information on Galapagos marine iguanas if Nielsen was interested in his proposal. Glick mailed three more letters containing similar confidential information during the next month. The Federal Bureau of Investigation, having been asked to investigate the communications, placed an advertisement in the trade journal as directed by Glick. Glick then mailed Nielsen a fifth anonymous letter containing more confidential information and offering equipment developed by Arbitron.
Glick had no previous convictions and stipulated in his plea agreement that his offense level was 18, which, combined with a criminal history category I, yielded a sentencing guidelines range of 27-33 months. At his sentencing hearing, Glick offered the testimony of a psychiatrist who had evaluated him and had concluded that Glick suffered from a significantly reduced mental capacity at the time he committed the offense and that his reduced mental capacity significantly contributed to his actions. The government elected not to present any testimony to refute the psychiatrist’s conclusions. The sentencing court determined that a departure from the guidelines was warranted because of Glick’s diminished capacity and because the *338 commission of this offense was aberrant behavior. The court sentenced Glick to five years probation with certain conditions.
III.
The government contends that the sentencing court erred in finding that Glick was entitled to a departure sentence for either aberrant behavior or diminished capacity. When reviewing a departure sentence, this court will
first examine de novo the specific reasons cited by the district court in support of its sentence outside the Guidelines range to ascertain whether those reasons encompass factors “not adequately taken into consideration by the Sentencing Commission in formulating the guidelines.” If the sentencing court identified one or more factors potentially warranting departure, we apply a clearly erroneous standard and review the factual support in the record for those identified circumstances. Upon ascertaining that there is an adequate factual basis for the factors, we apply an abuse of discretion standard to determine if, on balance, the cited departure factors are of sufficient importance in the case such that a sentence outside the Guidelines range “should result.” Similarly, we apply an abuse of discretion standard to determine if the extent of departure was reasonable.
United States v. Hummer,
A.
The government argues that Glick’s offense does not constitute a single act of aberrant behavior as contemplated by the sentencing guidelines. Glick’s conduct involved sending five separate letters containing misappropriated, confidential information over a course of ten weeks and devising a code to use in communicating through a national trade publication. Among items officers discovered in Glick’s home were equipment stolen from Arbitran and a list of names and addresses of officers of Nielsen. The government contends that his attempt to remain anonymous indicates foresight, planning, and cognizance of the illicit nature of his activities.
Following congressional direction, the Sentencing Commission designed the guidelines to produce an appropriate sentence for a first offender.
See
28 U.S.C.A. § 994(j) (West Supp.1991). Aberrant behavior, therefore, means something more than merely a first offense. A single act of aberrant behavior suggests “a spontaneous and seemingly thoughtless act rather than one which was the result of substantial planning because an act which occurs suddenly and is not the result of a continued reflective process is one for which the defendant may be arguably less accountable.”
United States v. Carey,
*339 B.
The government also challenges the determination by the district court to depart on the basis of Glick’s diminished capacity. A sentencing court may depart if it finds that “the defendant committed a nonviolent offense while suffering from significantly reduced mental capacity not resulting from voluntary use of drugs or other intoxicants.” U.S.S.G. § 5K2.13, p.s. The sentencing court found that Glick met these criteria and we review this determination under a clearly erroneous standard.
Hummer,
Having concluded that the finding of diminished capacity is not clearly erroneous, we must consider whether the sentencing court abused its discretion in departing from the sentencing guidelines range on the basis of this factor. Diminished capacity need not be the sole cause of the offense to justify a departure, but should “comprise[ ] a contributing factor in the commission of the offense.”
United States v. Ruklick,
we must determine whether the sentencing court abused its discretion in the extent of the departure. As noted, Glick’s psychiatrist testified that Glick’s didicapacity contributed significantly to the commission of the offense. On the basis of this testimony, the sentencing court found that Glick was suffering from stress, “a personality disorder and some possible loss of contact with reality” that resulted in “significantly reduced mental capacity.”
The extent of the departure should “reflect the extent to which reduced mental capacity contributed to the commission of the offense.” U.S.S.G. § 5K2.13, p.s. Because we are governed on review of this issue by an abuse of discretion standard,
Hummer,
C.
Although the sentencing court based its departure upon two factors, this court should uphold the departure on the basis of one factor if “the proper factor[] justifies] the magnitude of departure.”
United States v. Franklin,
[A] departure which rests on a combination of valid and invalid grounds may be affirmed so long as (1) the direction and degree of the departure are reasonable in relation to the remaining (valid) ground, (2) excision of the improper ground does *340 not obscure or defeat the expressed reasoning of the district court, and (3) the reviewing court is left, on the record as a whole, with the definite and firm conviction that removal of the inappropriate ground would not be likely to alter the district court's view of the sentence rightfully to be imposed.
United States v. Diaz-Bastardo,
IV.
Having affirmed the departure sentence, we need not address the remaining issue raised by the government.
REVERSED IN PART, AFFIRMED IN PART, AND AFFIRMED AS TO THE RESULT.
Notes
We do not agree with the approach of the Ninth Circuit that a series of actions calculated to
*339
further criminal misconduct can be classified as aberrant behavior.
United States v. Takai,
